diff --git a/js/src/builtin/SIMD.cpp b/js/src/builtin/SIMD.cpp
index 69b07a20d58b..279c777e1645 100644
--- a/js/src/builtin/SIMD.cpp
+++ b/js/src/builtin/SIMD.cpp
@@ -221,6 +221,9 @@ static const JSFunctionSpec SimdTypedObjectMethods[] = {
 //
 // The JS_INLINABLE_FN macro refers to js::JitInfo_##native which we provide as
 // Simd##Type##_##Operation
+//
+// /!\ Don't forget to keep this list in sync with the SIMD instrinics used in
+// SelfHosting.cpp.
 
 namespace js {
 namespace jit {
diff --git a/js/src/builtin/SIMD.h b/js/src/builtin/SIMD.h
index 3d0e0d38f7e0..4d45c30c162f 100644
--- a/js/src/builtin/SIMD.h
+++ b/js/src/builtin/SIMD.h
@@ -1020,6 +1020,16 @@ bool IsVectorObject(HandleValue v);
 template<typename V>
 bool ToSimdConstant(JSContext* cx, HandleValue v, jit::SimdConstant* out);
 
+JSObject*
+InitSimdClass(JSContext* cx, HandleObject obj);
+
+namespace jit {
+
+extern const JSJitInfo JitInfo_SimdInt32x4_extractLane;
+extern const JSJitInfo JitInfo_SimdFloat32x4_extractLane;
+
+} // namespace jit
+
 #define DECLARE_SIMD_FLOAT32X4_FUNCTION(Name, Func, Operands)   \
 extern bool                                                     \
 simd_float32x4_##Name(JSContext* cx, unsigned argc, Value* vp);
@@ -1092,9 +1102,6 @@ simd_bool64x2_##Name(JSContext* cx, unsigned argc, Value* vp);
 BOOL64X2_FUNCTION_LIST(DECLARE_SIMD_BOOL64x2_FUNCTION)
 #undef DECLARE_SIMD_BOOL64x2_FUNCTION
 
-JSObject*
-InitSimdClass(JSContext* cx, HandleObject obj);
-
 }  /* namespace js */
 
 #endif /* builtin_SIMD_h */
diff --git a/js/src/jit-test/tests/SIMD/bug1241872.js b/js/src/jit-test/tests/SIMD/bug1241872.js
new file mode 100644
index 000000000000..31847701633e
--- /dev/null
+++ b/js/src/jit-test/tests/SIMD/bug1241872.js
@@ -0,0 +1,10 @@
+if (typeof SIMD !== 'object')
+    exit(0);
+
+function test() {
+    return SIMD.Float32x4().toSource();
+}
+
+var r = '';
+for (var i = 0; i < 10000; i++)
+    r = test();
diff --git a/js/src/vm/SelfHosting.cpp b/js/src/vm/SelfHosting.cpp
index 55f9a8fc18d7..a1defbddb0f7 100644
--- a/js/src/vm/SelfHosting.cpp
+++ b/js/src/vm/SelfHosting.cpp
@@ -1652,11 +1652,11 @@ static const JSFunctionSpec intrinsic_functions[] = {
 
     JS_FN("std_SIMD_Int8x16_extractLane",        simd_int8x16_extractLane,     2,0),
     JS_FN("std_SIMD_Int16x8_extractLane",        simd_int16x8_extractLane,     2,0),
-    JS_INLINABLE_FN("std_SIMD_Int32x4_extractLane",   simd_int32x4_extractLane,  2,0, SimdInt32x4),
+    JS_INLINABLE_FN("std_SIMD_Int32x4_extractLane",   simd_int32x4_extractLane,  2,0, SimdInt32x4_extractLane),
     JS_FN("std_SIMD_Uint8x16_extractLane",       simd_uint8x16_extractLane,    2,0),
     JS_FN("std_SIMD_Uint16x8_extractLane",       simd_uint16x8_extractLane,    2,0),
     JS_FN("std_SIMD_Uint32x4_extractLane",       simd_uint32x4_extractLane,    2,0),
-    JS_INLINABLE_FN("std_SIMD_Float32x4_extractLane", simd_float32x4_extractLane,2,0, SimdFloat32x4),
+    JS_INLINABLE_FN("std_SIMD_Float32x4_extractLane", simd_float32x4_extractLane,2,0, SimdFloat32x4_extractLane),
     JS_FN("std_SIMD_Float64x2_extractLane",      simd_float64x2_extractLane,   2,0),
     JS_FN("std_SIMD_Bool8x16_extractLane",       simd_bool8x16_extractLane,    2,0),
     JS_FN("std_SIMD_Bool16x8_extractLane",       simd_bool16x8_extractLane,    2,0),