diff --git a/openbsd-compat/reallocarray.c b/openbsd-compat/reallocarray.c
index 9beec71..1d6bc29 100644
--- a/openbsd-compat/reallocarray.c
+++ b/openbsd-compat/reallocarray.c
@@ -19,6 +19,8 @@
 
 #include "includes.h"
 
+#ifndef HAVE_REALLOCARRAY
+
 #include <sys/types.h>
 #include <errno.h>
 #include <stdint.h>
@@ -40,3 +42,5 @@ reallocarray(void *optr, size_t nmemb, size_t size)
 	}
 	return realloc(optr, size * nmemb);
 }
+
+#endif /* HAVE_REALLOCARRAY */