diff --git a/js/src/jit/x86-shared/AssemblerBuffer-x86-shared.cpp b/js/src/jit/x86-shared/AssemblerBuffer-x86-shared.cpp
index 6dec02a31455..4c99a6a14a8c 100644
--- a/js/src/jit/x86-shared/AssemblerBuffer-x86-shared.cpp
+++ b/js/src/jit/x86-shared/AssemblerBuffer-x86-shared.cpp
@@ -10,7 +10,9 @@
 
 #include "jsopcode.h"
 
-void js::jit::GenericAssembler::spew(const char* fmt, va_list va)
+#ifdef JS_JITSPEW
+void
+js::jit::GenericAssembler::spew(const char* fmt, va_list va)
 {
     // Buffer to hold the formatted string. Note that this may contain
     // '%' characters, so do not pass it directly to printf functions.
@@ -23,3 +25,4 @@ void js::jit::GenericAssembler::spew(const char* fmt, va_list va)
         js::jit::JitSpew(js::jit::JitSpew_Codegen, "%s", buf);
     }
 }
+#endif
diff --git a/js/src/jit/x86-shared/AssemblerBuffer-x86-shared.h b/js/src/jit/x86-shared/AssemblerBuffer-x86-shared.h
index 102cc74b8465..214351ebcbb8 100644
--- a/js/src/jit/x86-shared/AssemblerBuffer-x86-shared.h
+++ b/js/src/jit/x86-shared/AssemblerBuffer-x86-shared.h
@@ -192,28 +192,39 @@ namespace jit {
 
     class GenericAssembler
     {
+#ifdef JS_JITSPEW
         Sprinter* printer;
-
+#endif
       public:
 
-        GenericAssembler() : printer(nullptr) {}
+        GenericAssembler()
+#ifdef JS_JITSPEW
+          : printer(nullptr)
+#endif
+        {}
 
         void setPrinter(Sprinter* sp)
         {
+#ifdef JS_JITSPEW
             printer = sp;
+#endif
         }
 
-        void spew(const char* fmt, ...) MOZ_FORMAT_PRINTF(2, 3)
+        MOZ_ALWAYS_INLINE void spew(const char* fmt, ...) MOZ_FORMAT_PRINTF(2, 3)
         {
+#ifdef JS_JITSPEW
             if (MOZ_UNLIKELY(printer || JitSpewEnabled(JitSpew_Codegen))) {
                 va_list va;
                 va_start(va, fmt);
                 spew(fmt, va);
                 va_end(va);
             }
+#endif
         }
 
+#ifdef JS_JITSPEW
         MOZ_COLD void spew(const char* fmt, va_list va);
+#endif
     };
 
 } // namespace jit