diff --git a/cranelift/simplejit/src/memory.rs b/cranelift/simplejit/src/memory.rs
index 68c3fd768c..2618233c63 100644
--- a/cranelift/simplejit/src/memory.rs
+++ b/cranelift/simplejit/src/memory.rs
@@ -111,7 +111,7 @@ impl Drop for PtrLen {
     fn drop(&mut self) {
         if !self.ptr.is_null() {
             unsafe {
-                region::protect(self.ptr, self.len, region::Protection::ReadWrite)
+                region::protect(self.ptr, self.len, region::Protection::READ_WRITE)
                     .expect("unable to unprotect memory");
                 libc::free(self.ptr as _);
             }
@@ -179,7 +179,7 @@ impl Memory {
             for &PtrLen { ref map, ptr, len } in &self.allocations[self.executable..] {
                 if len != 0 && map.is_some() {
                     unsafe {
-                        region::protect(ptr, len, region::Protection::ReadExecute)
+                        region::protect(ptr, len, region::Protection::READ_EXECUTE)
                             .expect("unable to make memory readable+executable");
                     }
                 }
@@ -191,7 +191,7 @@ impl Memory {
             for &PtrLen { ptr, len } in &self.allocations[self.executable..] {
                 if len != 0 {
                     unsafe {
-                        region::protect(ptr, len, region::Protection::ReadExecute)
+                        region::protect(ptr, len, region::Protection::READ_EXECUTE)
                             .expect("unable to make memory readable+executable");
                     }
                 }
@@ -208,7 +208,7 @@ impl Memory {
             for &PtrLen { ref map, ptr, len } in &self.allocations[self.executable..] {
                 if len != 0 && map.is_some() {
                     unsafe {
-                        region::protect(ptr, len, region::Protection::Read)
+                        region::protect(ptr, len, region::Protection::READ)
                             .expect("unable to make memory readonly");
                     }
                 }
@@ -220,7 +220,7 @@ impl Memory {
             for &PtrLen { ptr, len } in &self.allocations[self.executable..] {
                 if len != 0 {
                     unsafe {
-                        region::protect(ptr, len, region::Protection::Read)
+                        region::protect(ptr, len, region::Protection::READ)
                             .expect("unable to make memory readonly");
                     }
                 }
diff --git a/crates/jit/src/code_memory.rs b/crates/jit/src/code_memory.rs
index 9ad259f995..134a8dca30 100644
--- a/crates/jit/src/code_memory.rs
+++ b/crates/jit/src/code_memory.rs
@@ -120,7 +120,7 @@ impl CodeMemory {
 
             if !m.is_empty() {
                 unsafe {
-                    region::protect(m.as_mut_ptr(), m.len(), region::Protection::ReadExecute)
+                    region::protect(m.as_mut_ptr(), m.len(), region::Protection::READ_EXECUTE)
                 }
                 .expect("unable to make memory readonly and executable");
             }
diff --git a/crates/runtime/src/mmap.rs b/crates/runtime/src/mmap.rs
index 8cba107404..483ec5be09 100644
--- a/crates/runtime/src/mmap.rs
+++ b/crates/runtime/src/mmap.rs
@@ -182,7 +182,7 @@ impl Mmap {
 
         // Commit the accessible size.
         let ptr = self.ptr as *const u8;
-        unsafe { region::protect(ptr.add(start), len, region::Protection::ReadWrite) }
+        unsafe { region::protect(ptr.add(start), len, region::Protection::READ_WRITE) }
             .map_err(|e| e.to_string())
     }