diff --git a/configure.ac b/configure.ac
index 3bdd7bb..186d309 100644
--- a/configure.ac
+++ b/configure.ac
@@ -392,7 +392,7 @@ if test "x$enable_hardening" != "xno"; then
 	dnl Must not have -O0 but must have a -O for -D_FORTIFY_SOURCE=2
 	TMP1="$(echo $CFLAGS | sed -n 's/.*\(-O0\).*/\1/p')"
 	TMP2="$(echo $CFLAGS | sed -n 's/.*\(-O\).*/\1/p')"
-	if test -z "$TMP1" && test -n "$TPM2"; then
+	if test -z "$TMP1" && test -n "$TMP2"; then
 		HARDENING_CFLAGS="$HARDENING_CFLAGS -D_FORTIFY_SOURCE=2 "
 	fi
 	dnl Check linker for 'relro' and 'now'