diff --git a/cranelift/wasm/src/code_translator.rs b/cranelift/wasm/src/code_translator.rs
index fef3215c52..0bf7f4b0b4 100644
--- a/cranelift/wasm/src/code_translator.rs
+++ b/cranelift/wasm/src/code_translator.rs
@@ -907,7 +907,7 @@ pub fn translate_operator<FE: FuncEnvironment + ?Sized>(
         | Operator::I64AtomicRmw16UCmpxchg { .. }
         | Operator::I64AtomicRmw32UCmpxchg { .. }
         | Operator::Fence { .. } => {
-            wasm_unsupported!("proposed thread operator {:?}", op);
+            return Err(wasm_unsupported!("proposed thread operator {:?}", op));
         }
         Operator::MemoryInit { .. }
         | Operator::DataDrop { .. }
@@ -920,7 +920,7 @@ pub fn translate_operator<FE: FuncEnvironment + ?Sized>(
         | Operator::TableSet { .. }
         | Operator::TableGrow { .. }
         | Operator::TableSize { .. } => {
-            wasm_unsupported!("proposed bulk memory operator {:?}", op);
+            return Err(wasm_unsupported!("proposed bulk memory operator {:?}", op));
         }
         Operator::V128Const { value } => {
             let handle = builder.func.dfg.constants.insert(value.bytes().to_vec());
@@ -1109,7 +1109,7 @@ pub fn translate_operator<FE: FuncEnvironment + ?Sized>(
         | Operator::I16x8LoadSplat { .. }
         | Operator::I32x4LoadSplat { .. }
         | Operator::I64x2LoadSplat { .. } => {
-            wasm_unsupported!("proposed SIMD operator {:?}", op);
+            return Err(wasm_unsupported!("proposed SIMD operator {:?}", op));
         }
     };
     Ok(())
diff --git a/cranelift/wasm/src/environ/spec.rs b/cranelift/wasm/src/environ/spec.rs
index ba87cc992a..bce06e4cd0 100644
--- a/cranelift/wasm/src/environ/spec.rs
+++ b/cranelift/wasm/src/environ/spec.rs
@@ -80,7 +80,7 @@ pub enum WasmError {
 /// on the arguments to this macro.
 #[macro_export]
 macro_rules! wasm_unsupported {
-    ($($arg:tt)*) => { return Err($crate::environ::WasmError::Unsupported(format!($($arg)*))) }
+    ($($arg:tt)*) => { $crate::environ::WasmError::Unsupported(format!($($arg)*)) }
 }
 
 impl From<BinaryReaderError> for WasmError {
diff --git a/cranelift/wasm/src/func_translator.rs b/cranelift/wasm/src/func_translator.rs
index cced9d87e6..ef1eecfa57 100644
--- a/cranelift/wasm/src/func_translator.rs
+++ b/cranelift/wasm/src/func_translator.rs
@@ -184,7 +184,7 @@ fn declare_locals<FE: FuncEnvironment + ?Sized>(
             builder.ins().vconst(ir::types::I8X16, constant_handle)
         }
         AnyRef => builder.ins().null(environ.reference_type()),
-        ty => wasm_unsupported!("unsupported local type {:?}", ty),
+        ty => return Err(wasm_unsupported!("unsupported local type {:?}", ty)),
     };
 
     let ty = builder.func.dfg.value_type(zeroval);
diff --git a/cranelift/wasm/src/sections_translator.rs b/cranelift/wasm/src/sections_translator.rs
index c8c66529ad..a961a71ca9 100644
--- a/cranelift/wasm/src/sections_translator.rs
+++ b/cranelift/wasm/src/sections_translator.rs
@@ -53,7 +53,12 @@ pub fn parse_type_section(
                 }));
                 environ.declare_signature(sig)?;
             }
-            ty => wasm_unsupported!("unsupported type in type section: {:?}", ty),
+            ty => {
+                return Err(wasm_unsupported!(
+                    "unsupported type in type section: {:?}",
+                    ty
+                ))
+            }
         }
     }
     Ok(())
@@ -209,7 +214,10 @@ pub fn parse_global_section(
                 GlobalInit::GetGlobal(GlobalIndex::from_u32(global_index))
             }
             ref s => {
-                wasm_unsupported!("unsupported init expr in global section: {:?}", s);
+                return Err(wasm_unsupported!(
+                    "unsupported init expr in global section: {:?}",
+                    s
+                ));
             }
         };
         let global = Global {
@@ -284,7 +292,10 @@ pub fn parse_element_section<'data>(
                     (Some(GlobalIndex::from_u32(global_index)), 0)
                 }
                 ref s => {
-                    wasm_unsupported!("unsupported init expr in element section: {:?}", s);
+                    return Err(wasm_unsupported!(
+                        "unsupported init expr in element section: {:?}",
+                        s
+                    ));
                 }
             };
             let items_reader = items.get_items_reader()?;
@@ -300,7 +311,10 @@ pub fn parse_element_section<'data>(
                 elems.into_boxed_slice(),
             )?
         } else {
-            wasm_unsupported!("unsupported passive elements section: {:?}", kind);
+            return Err(wasm_unsupported!(
+                "unsupported passive elements section: {:?}",
+                kind
+            ));
         }
     }
     Ok(())
@@ -340,7 +354,12 @@ pub fn parse_data_section<'data>(
                 Operator::GetGlobal { global_index } => {
                     (Some(GlobalIndex::from_u32(global_index)), 0)
                 }
-                ref s => wasm_unsupported!("unsupported init expr in data section: {:?}", s),
+                ref s => {
+                    return Err(wasm_unsupported!(
+                        "unsupported init expr in data section: {:?}",
+                        s
+                    ))
+                }
             };
             environ.declare_data_initialization(
                 MemoryIndex::from_u32(memory_index),
@@ -349,7 +368,10 @@ pub fn parse_data_section<'data>(
                 data,
             )?;
         } else {
-            wasm_unsupported!("unsupported passive data section: {:?}", kind);
+            return Err(wasm_unsupported!(
+                "unsupported passive data section: {:?}",
+                kind
+            ));
         }
     }
 
diff --git a/cranelift/wasm/src/translation_utils.rs b/cranelift/wasm/src/translation_utils.rs
index 95553c6e48..df910c534b 100644
--- a/cranelift/wasm/src/translation_utils.rs
+++ b/cranelift/wasm/src/translation_utils.rs
@@ -124,7 +124,7 @@ pub fn type_to_type(ty: wasmparser::Type) -> WasmResult<ir::Type> {
         wasmparser::Type::F32 => Ok(ir::types::F32),
         wasmparser::Type::F64 => Ok(ir::types::F64),
         wasmparser::Type::V128 => Ok(ir::types::I8X16),
-        ty => wasm_unsupported!("type_to_type: wasm type {:?}", ty),
+        ty => Err(wasm_unsupported!("type_to_type: wasm type {:?}", ty)),
     }
 }
 
@@ -138,7 +138,10 @@ pub fn tabletype_to_type(ty: wasmparser::Type) -> WasmResult<Option<ir::Type>> {
         wasmparser::Type::F64 => Ok(Some(ir::types::F64)),
         wasmparser::Type::V128 => Ok(Some(ir::types::I8X16)),
         wasmparser::Type::AnyFunc => Ok(None),
-        ty => wasm_unsupported!("tabletype_to_type: table wasm type {:?}", ty),
+        ty => Err(wasm_unsupported!(
+            "tabletype_to_type: table wasm type {:?}",
+            ty
+        )),
     }
 }
 
@@ -152,12 +155,12 @@ pub fn blocktype_to_type(ty_or_ft: wasmparser::TypeOrFuncType) -> WasmResult<Opt
             wasmparser::Type::F64 => Ok(Some(ir::types::F64)),
             wasmparser::Type::V128 => Ok(Some(ir::types::I8X16)),
             wasmparser::Type::EmptyBlockType => Ok(None),
-            ty => wasm_unsupported!("blocktype_to_type: type {:?}", ty),
+            ty => Err(wasm_unsupported!("blocktype_to_type: type {:?}", ty)),
         },
-        wasmparser::TypeOrFuncType::FuncType(_) => wasm_unsupported!(
+        wasmparser::TypeOrFuncType::FuncType(_) => Err(wasm_unsupported!(
             "blocktype_to_type: multi-value block signature {:?}",
             ty_or_ft
-        ),
+        )),
     }
 }
 
@@ -181,10 +184,10 @@ pub fn num_return_values(ty: wasmparser::TypeOrFuncType) -> WasmResult<usize> {
             | wasmparser::Type::I64
             | wasmparser::Type::F64
             | wasmparser::Type::V128 => Ok(1),
-            ty => wasm_unsupported!("unsupported return value type {:?}", ty),
+            ty => Err(wasm_unsupported!("unsupported return value type {:?}", ty)),
         },
         wasmparser::TypeOrFuncType::FuncType(_) => {
-            wasm_unsupported!("multi-value block signature {:?}", ty);
+            Err(wasm_unsupported!("multi-value block signature {:?}", ty))
         }
     }
 }