diff --git a/src/mtype.h b/src/mtype.h
index aad6278b2e666..8ef1009b9e2f8 100644
--- a/src/mtype.h
+++ b/src/mtype.h
@@ -328,7 +328,7 @@ struct mtype {
         int armor_bullet = -1;  /** innate armor vs. bullet */
         int armor_acid = -1;    /** innate armor vs. acid */
         int armor_fire = -1;    /** innate armor vs. fire */
-        weakpoints weakpoints;
+        ::weakpoints weakpoints;
 
         // Bleed rate in percent, 0 makes the monster immune to bleeding
         int bleed_rate = 100;