--- a/tools/profiler/GeckoProfilerImpl.h
+++ b/tools/profiler/GeckoProfilerImpl.h
@@ -301,18 +301,18 @@ public:
       char buff[SAMPLER_MAX_STRING];
 
       // We have to use seperate printf's because we're using
       // the vargs.
 #if _MSC_VER
       _vsnprintf(buff, SAMPLER_MAX_STRING, aFormat, args);
       _snprintf(mDest, SAMPLER_MAX_STRING, "%s %s", aDefault, buff);
 #else
-      vsnprintf(buff, SAMPLER_MAX_STRING, aFormat, args);
-      snprintf(mDest, SAMPLER_MAX_STRING, "%s %s", aDefault, buff);
+      ::vsnprintf(buff, SAMPLER_MAX_STRING, aFormat, args);
+      ::snprintf(mDest, SAMPLER_MAX_STRING, "%s %s", aDefault, buff);
 #endif
       mHandle = mozilla_sampler_call_enter(mDest, this, true, line);
       va_end(args);
     } else {
       mHandle = mozilla_sampler_call_enter(aDefault, nullptr, false, line);
     }
   }
   ~SamplerStackFramePrintfRAII() {