diff --git a/src/vid_hercules.c b/src/vid_hercules.c
index 41dacde01..d3cd051e3 100644
--- a/src/vid_hercules.c
+++ b/src/vid_hercules.c
@@ -398,6 +398,9 @@ static device_config_t hercules_config[] =
                         }
                 },
                 .default_int = 0
+        },
+        {
+                .type = -1
         }
 };
 #endif
diff --git a/src/vid_mda.c b/src/vid_mda.c
index 9933cebab..be38890bd 100644
--- a/src/vid_mda.c
+++ b/src/vid_mda.c
@@ -354,6 +354,9 @@ static device_config_t mda_config[] =
                         }
                 },
                 .default_int = 0
+        },
+        {
+                .type = -1
         }
 };
 #endif