diff --git a/src/Makefile b/src/Makefile
index 55be4d92..6f1f812f 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -15,7 +15,7 @@ link  := -s
 # link += -lgcov
 
 # profile-guided optimization:
-flags += -fprofile-use
+# flags += -fprofile-use
 
 ################
 ### platform ###