diff --git a/cranelift/filetests/filetests/runtests/extend.clif b/cranelift/filetests/filetests/runtests/extend.clif
index 42e77f7f0b..4ce87b411f 100644
--- a/cranelift/filetests/filetests/runtests/extend.clif
+++ b/cranelift/filetests/filetests/runtests/extend.clif
@@ -1,3 +1,4 @@
+test interpret
 test run
 target aarch64
 target s390x
@@ -210,4 +211,3 @@ block0(v0: i32, v1: i32):
 }
 ; run: %add_sextend32_64(0xffff_ee00, 0x1000_0001) == 0x0000_0000_0fff_ee01
 ; run: %add_sextend32_64(0xffff_ee00, 0x9000_0001) == 0xffff_ffff_8fff_ee01
-
diff --git a/cranelift/filetests/filetests/runtests/i128-extend.clif b/cranelift/filetests/filetests/runtests/i128-extend.clif
index a0d1b67276..72b9876414 100644
--- a/cranelift/filetests/filetests/runtests/i128-extend.clif
+++ b/cranelift/filetests/filetests/runtests/i128-extend.clif
@@ -1,3 +1,4 @@
+test interpret
 test run
 set enable_llvm_abi_extensions=true
 target aarch64
diff --git a/cranelift/interpreter/src/value.rs b/cranelift/interpreter/src/value.rs
index e90da9e223..cb7ac98321 100644
--- a/cranelift/interpreter/src/value.rs
+++ b/cranelift/interpreter/src/value.rs
@@ -343,15 +343,22 @@ impl Value for DataValue {
                 (DataValue::U8(n), types::I16) => DataValue::U16(n as u16),
                 (DataValue::U8(n), types::I32) => DataValue::U32(n as u32),
                 (DataValue::U8(n), types::I64) => DataValue::U64(n as u64),
+                (DataValue::U8(n), types::I128) => DataValue::U128(n as u128),
                 (DataValue::I8(n), types::I16) => DataValue::I16(n as i16),
                 (DataValue::I8(n), types::I32) => DataValue::I32(n as i32),
                 (DataValue::I8(n), types::I64) => DataValue::I64(n as i64),
+                (DataValue::I8(n), types::I128) => DataValue::I128(n as i128),
                 (DataValue::U16(n), types::I32) => DataValue::U32(n as u32),
                 (DataValue::U16(n), types::I64) => DataValue::U64(n as u64),
+                (DataValue::U16(n), types::I128) => DataValue::U128(n as u128),
                 (DataValue::I16(n), types::I32) => DataValue::I32(n as i32),
                 (DataValue::I16(n), types::I64) => DataValue::I64(n as i64),
+                (DataValue::I16(n), types::I128) => DataValue::I128(n as i128),
                 (DataValue::U32(n), types::I64) => DataValue::U64(n as u64),
+                (DataValue::U32(n), types::I128) => DataValue::U128(n as u128),
                 (DataValue::I32(n), types::I64) => DataValue::I64(n as i64),
+                (DataValue::I32(n), types::I128) => DataValue::I128(n as i128),
+                (DataValue::U64(n), types::I128) => DataValue::U128(n as u128),
                 (DataValue::I64(n), types::I128) => DataValue::I128(n as i128),
                 (dv, _) => unimplemented!("conversion: {} -> {:?}", dv.ty(), kind),
             },
@@ -359,15 +366,22 @@ impl Value for DataValue {
                 (DataValue::U8(n), types::I16) => DataValue::U16(n as u16),
                 (DataValue::U8(n), types::I32) => DataValue::U32(n as u32),
                 (DataValue::U8(n), types::I64) => DataValue::U64(n as u64),
+                (DataValue::U8(n), types::I128) => DataValue::U128(n as u128),
                 (DataValue::I8(n), types::I16) => DataValue::I16(n as u8 as i16),
                 (DataValue::I8(n), types::I32) => DataValue::I32(n as u8 as i32),
                 (DataValue::I8(n), types::I64) => DataValue::I64(n as u8 as i64),
+                (DataValue::I8(n), types::I128) => DataValue::I128(n as u8 as i128),
                 (DataValue::U16(n), types::I32) => DataValue::U32(n as u32),
                 (DataValue::U16(n), types::I64) => DataValue::U64(n as u64),
+                (DataValue::U16(n), types::I128) => DataValue::U128(n as u128),
                 (DataValue::I16(n), types::I32) => DataValue::I32(n as u16 as i32),
                 (DataValue::I16(n), types::I64) => DataValue::I64(n as u16 as i64),
+                (DataValue::I16(n), types::I128) => DataValue::I128(n as u16 as i128),
                 (DataValue::U32(n), types::I64) => DataValue::U64(n as u64),
+                (DataValue::U32(n), types::I128) => DataValue::U128(n as u128),
                 (DataValue::I32(n), types::I64) => DataValue::I64(n as u32 as i64),
+                (DataValue::I32(n), types::I128) => DataValue::I128(n as u32 as i128),
+                (DataValue::U64(n), types::I128) => DataValue::U128(n as u128),
                 (DataValue::I64(n), types::I128) => DataValue::I128(n as u64 as i128),
                 (from, to) if from.ty() == to => from,
                 (dv, _) => unimplemented!("conversion: {} -> {:?}", dv.ty(), kind),