diff --git a/regress/unittests/sshsig/tests.c b/regress/unittests/sshsig/tests.c
index d82d4897a..7365d2492 100644
--- a/regress/unittests/sshsig/tests.c
+++ b/regress/unittests/sshsig/tests.c
@@ -12,7 +12,9 @@
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <stdio.h>
+#ifdef HAVE_STDINT_H
 #include <stdint.h>
+#endif
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>