diff --git a/src/core/openssl_wrapper.h b/src/core/openssl_wrapper.h
index b1678375..50a75749 100644
--- a/src/core/openssl_wrapper.h
+++ b/src/core/openssl_wrapper.h
@@ -60,6 +60,7 @@
 #else
 	// For all other systems, we use GnuTLS.
 	#include <gnutls/openssl.h>
+	#include <gcrypt.h>
 	#define PKTH_USE_GNUTLS
 #endif