diff --git a/configure b/configure
index 2cb849f4ee7b..ca0c519b880d 100755
--- a/configure
+++ b/configure
@@ -2513,7 +2513,7 @@ case "$target" in
 *-*-aix*)
 	if test ! "$GNU_CC"; then
 		DSO_LDOPTS='-ldl -bM:SRE -brtl -berok -bexpall -bnoentry -L$(DIST)/lib'
-		DSO_CFLAGS='-DPIC -brtl -O -qnortti -qflag=w:w'
+		DSO_CFLAGS='-DPIC -brtl -qnortti -qflag=w:w'
 	fi
 	MKSHLIB='/usr/ibmcxx/bin/makeC++SharedLib_r -p1 -brtl -berok --'
 	;;