diff --git a/findcrcs.cc b/findcrcs.cc
index 87863ef..306f5d7 100644
--- a/findcrcs.cc
+++ b/findcrcs.cc
@@ -33,6 +33,7 @@
 
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <cerrno>
 #include <fcntl.h>
 #include <unistd.h>
 #include <stdlib.h>