diff --git a/packages/toolchain/devel/eglibc/build b/packages/toolchain/devel/eglibc/build
index d262776684..522beb382d 100755
--- a/packages/toolchain/devel/eglibc/build
+++ b/packages/toolchain/devel/eglibc/build
@@ -6,7 +6,7 @@ strip_lto  # Fails to compile with GCC's link time optimization.
 strip_gold # Fails to compile using the gold linker.
 
 # Filter out some problematic CFLAGS
-  CFLAGS=`echo $CFLAGS | sed -e "s|-ffast-math||" -e "s|-O?||"`
+  CFLAGS=`echo $CFLAGS | sed -e "s|-ffast-math||"` # -e "s|-O.|-O3|"
 
 # set some CFLAGS we need
   CFLAGS="$CFLAGS -g -fno-stack-protector"