diff --git a/host/dsig/vllp_alertstream.c b/host/dsig/vllp_alertstream.c
index a7383780..2e86b436 100644
--- a/host/dsig/vllp_alertstream.c
+++ b/host/dsig/vllp_alertstream.c
@@ -85,7 +85,7 @@ vllp_alertstream_t *
 vllp_alertstream_create(vllp_t *v, void *opaque,
                         void (*mark)(void *opaque),
                         void (*raise)(void *opaque, const char *key,
-                                      int level, const char *msg),
+                                      alert_level_t level, const char *msg),
                         void (*sweep)(void *opaque))
 {
   vllp_alertstream_t *va = calloc(1, sizeof(vllp_alertstream_t));
diff --git a/host/dsig/vllp_alertstream.h b/host/dsig/vllp_alertstream.h
index 3ccb561f..3b982089 100644
--- a/host/dsig/vllp_alertstream.h
+++ b/host/dsig/vllp_alertstream.h
@@ -2,6 +2,15 @@
 
 #include <stdint.h>
 
+
+// Mirors the enum in include/mios/alert.h
+typedef enum {
+  ALERT_LEVEL_NOTICE,
+  ALERT_LEVEL_WARNING,
+  ALERT_LEVEL_ATTENTION,
+  ALERT_LEVEL_ERROR,
+} alert_level_t;
+
 struct vllp;
 typedef struct vllp_alertstream vllp_alertstream_t;
 
@@ -9,7 +18,7 @@ vllp_alertstream_t *vllp_alertstream_create(struct vllp *v, void *opaque,
                                             void (*mark)(void *opaque),
                                             void (*raise)(void *opaque,
                                                           const char *key,
-                                                          int level,
+                                                          alert_level_t level,
                                                           const char *msg),
                                             void (*sweep)(void *opaque));