--- a/js/src/jit/JitSpewer.cpp
+++ b/js/src/jit/JitSpewer.cpp
@@ -26,21 +26,21 @@
 
 #include "threading/LockGuard.h"
 
 #include "vm/HelperThreads.h"
 #include "vm/MutexIDs.h"
 
 #ifndef JIT_SPEW_DIR
 # if defined(_WIN32)
-#  define JIT_SPEW_DIR ""
+#  define JIT_SPEW_DIR "."
 # elif defined(__ANDROID__)
-#  define JIT_SPEW_DIR "/data/local/tmp/"
+#  define JIT_SPEW_DIR "/data/local/tmp"
 # else
-#  define JIT_SPEW_DIR "/tmp/"
+#  define JIT_SPEW_DIR "/tmp"
 # endif
 #endif
 
 using namespace js;
 using namespace js::jit;
 
 class IonSpewer
 {