diff --git a/include/common/regex.h b/include/common/regex.h
index 0069b2d..066f07e 100644
--- a/include/common/regex.h
+++ b/include/common/regex.h
@@ -26,6 +26,7 @@
 #include <string.h>
 
 #include <common/config.h>
+#include <common/hathreads.h>
 
 #ifdef USE_PCRE
 #include <pcre.h>