diff --git a/Makefile b/Makefile
index ea51ef6..36fe7b7 100644
--- a/Makefile
+++ b/Makefile
@@ -251,7 +251,10 @@ ifdef WHISPER_DEBUG
 		MK_CPPFLAGS += -D_GLIBCXX_ASSERTIONS
 	endif
 else
-	MK_CPPFLAGS += -DNDEBUG
+	MK_CPPFLAGS   += -DNDEBUG
+	MK_CFLAGS     += -O3
+	MK_CXXFLAGS   += -O3
+	MK_NVCCFLAGS  += -O3
 endif
 
 ifdef WHISPER_SANITIZE_THREAD