diff --git a/src/charon/plugins/nm/nm_creds.h b/src/charon/plugins/nm/nm_creds.h
index d77868552..421442c81 100644
--- a/src/charon/plugins/nm/nm_creds.h
+++ b/src/charon/plugins/nm/nm_creds.h
@@ -21,6 +21,7 @@
 #ifndef NM_CREDS_H_
 #define NM_CREDS_H_
 
+#include <credentials/keys/private_key.h>
 #include <credentials/credential_set.h>
 
 typedef struct nm_creds_t nm_creds_t;