diff --git a/llvm/lib/Target/WebAssembly/WebAssembly.td b/llvm/lib/Target/WebAssembly/WebAssembly.td
--- a/llvm/lib/Target/WebAssembly/WebAssembly.td
+++ b/llvm/lib/Target/WebAssembly/WebAssembly.td
@@ -86,7 +86,8 @@
 // Latest and greatest experimental version of WebAssembly. Bugs included!
 def : ProcessorModel<"bleeding-edge", NoSchedModel,
                       [FeatureSIMD128, FeatureAtomics,
-                       FeatureNontrappingFPToInt, FeatureSignExt]>;
+                       FeatureNontrappingFPToInt, FeatureSignExt,
+                       FeatureMutableGlobals]>;
 
 //===----------------------------------------------------------------------===//
 // Target Declaration
diff --git a/llvm/test/CodeGen/WebAssembly/target-features.ll b/llvm/test/CodeGen/WebAssembly/target-features.ll
--- a/llvm/test/CodeGen/WebAssembly/target-features.ll
+++ b/llvm/test/CodeGen/WebAssembly/target-features.ll
@@ -75,11 +75,14 @@
 ; SIMD128-NEXT: .ascii "simd128"
 
 ; +atomics, +nontrapping-fptoint, +sign-ext, +simd128
-; BLEEDING-EDGE-NEXT: .int8   4
+; BLEEDING-EDGE-NEXT: .int8   5
 ; BLEEDING-EDGE-NEXT: .int8   43
 ; BLEEDING-EDGE-NEXT: .int8   7
 ; BLEEDING-EDGE-NEXT: .ascii  "atomics"
 ; BLEEDING-EDGE-NEXT: .int8   43
+; BLEEDING-EDGE-NEXT: .int8   15
+; BLEEDING-EDGE-NEXT: .ascii  "mutable-globals"
+; BLEEDING-EDGE-NEXT: .int8   43
 ; BLEEDING-EDGE-NEXT: .int8   19
 ; BLEEDING-EDGE-NEXT: .ascii  "nontrapping-fptoint"
 ; BLEEDING-EDGE-NEXT: .int8   43