diff --git a/make/autoconf/flags-cflags.m4 b/make/autoconf/flags-cflags.m4
index f7f2ad53000..66e01dbe80c 100644
--- a/make/autoconf/flags-cflags.m4
+++ b/make/autoconf/flags-cflags.m4
@@ -316,7 +316,7 @@ AC_DEFUN([FLAGS_SETUP_OPTIMIZATION],
     C_O_FLAG_DEBUG="-Od"
     C_O_FLAG_DEBUG_JVM=""
     C_O_FLAG_NONE="-Od"
-    C_O_FLAG_SIZE="-Os"
+    C_O_FLAG_SIZE="-O1"
   fi
 
   # Now copy to C++ flags