diff --git a/configure b/configure
index f7f4268..9ae50d4 100755
--- a/configure
+++ b/configure
@@ -42,7 +42,7 @@ if [ -z "${CFLAGS}" ]; then
 fi
 
 CFLAGS="${CFLAGS} -W -Wall -Wextra -Wmissing-prototypes -Wstrict-prototypes"
-CFLAGS="${CFLAGS} -Wwrite-strings -Wno-unused-parameter"
+CFLAGS="${CFLAGS} -Wwrite-strings -Wpointer-sign -Wno-unused-parameter"
 CFLAGS="${CFLAGS} -Wno-missing-field-initializers"
 
 if [ -z "${LDFLAGS}" ]; then