diff --git a/js/src/ion/AsmJS.cpp b/js/src/ion/AsmJS.cpp
index 1f720585d68..1f0f1299cc3 100644
--- a/js/src/ion/AsmJS.cpp
+++ b/js/src/ion/AsmJS.cpp
@@ -5529,7 +5529,8 @@ js::IsAsmJSCompilationAvailable(JSContext *cx, unsigned argc, Value *vp)
 
 #ifdef JS_ASMJS
     bool available = JSC::MacroAssembler().supportsFloatingPoint() &&
-                     !cx->compartment->debugMode();
+                     !cx->compartment->debugMode() &&
+                     cx->hasOption(JSOPTION_ASMJS);
 #else
     bool available = false;
 #endif