diff --git a/src/textures/textures.h b/src/textures/textures.h
index 94fa38567..b9a9b8299 100644
--- a/src/textures/textures.h
+++ b/src/textures/textures.h
@@ -154,7 +154,7 @@ struct patch_t
 
 // All FTextures present their data to the world in 8-bit format, but if
 // the source data is something else, this is it.
-enum FTextureFormat
+enum FTextureFormat : uint32_t
 {
 	TEX_Pal,
 	TEX_Gray,
diff --git a/src/v_video.h b/src/v_video.h
index 98e81bc1f..aaa1492fa 100644
--- a/src/v_video.h
+++ b/src/v_video.h
@@ -53,7 +53,7 @@ void V_CalcCleanFacs (int designwidth, int designheight, int realwidth, int real
 
 class FTexture;
 struct FColormap;
-enum FTextureFormat;
+enum FTextureFormat : uint32_t;
 
 // TagItem definitions for DrawTexture. As far as I know, tag lists
 // originated on the Amiga.