diff --git a/dlls/wined3d/utils.c b/dlls/wined3d/utils.c
index a89a4c2fe41..6a1672929c0 100644
--- a/dlls/wined3d/utils.c
+++ b/dlls/wined3d/utils.c
@@ -249,6 +249,30 @@ const char* debug_d3dusage(DWORD usage) {
   }
 }
 
+const char* debug_d3ddeclusage(BYTE usage) {
+    switch (usage) {
+#define WINED3DDECLUSAGE_TO_STR(u) case u: return #u
+        WINED3DDECLUSAGE_TO_STR(D3DDECLUSAGE_POSITION);
+        WINED3DDECLUSAGE_TO_STR(D3DDECLUSAGE_BLENDWEIGHT);
+        WINED3DDECLUSAGE_TO_STR(D3DDECLUSAGE_BLENDINDICES);
+        WINED3DDECLUSAGE_TO_STR(D3DDECLUSAGE_NORMAL);
+        WINED3DDECLUSAGE_TO_STR(D3DDECLUSAGE_PSIZE);
+        WINED3DDECLUSAGE_TO_STR(D3DDECLUSAGE_TEXCOORD);
+        WINED3DDECLUSAGE_TO_STR(D3DDECLUSAGE_TANGENT);
+        WINED3DDECLUSAGE_TO_STR(D3DDECLUSAGE_BINORMAL);
+        WINED3DDECLUSAGE_TO_STR(D3DDECLUSAGE_TESSFACTOR);
+        WINED3DDECLUSAGE_TO_STR(D3DDECLUSAGE_POSITIONT);
+        WINED3DDECLUSAGE_TO_STR(D3DDECLUSAGE_COLOR);
+        WINED3DDECLUSAGE_TO_STR(D3DDECLUSAGE_FOG);
+        WINED3DDECLUSAGE_TO_STR(D3DDECLUSAGE_DEPTH);
+        WINED3DDECLUSAGE_TO_STR(D3DDECLUSAGE_SAMPLE);
+#undef WINED3DDECLUSAGE_TO_STR
+        default:
+            FIXME("Unrecognized %u declaration usage!\n", usage);
+            return "unrecognized";
+    }
+}
+
 const char* debug_d3dresourcetype(WINED3DRESOURCETYPE res) {
   switch (res) {
 #define RES_TO_STR(res) case res: return #res;
diff --git a/dlls/wined3d/wined3d_private.h b/dlls/wined3d/wined3d_private.h
index ca098018055..ab5eddf7caf 100644
--- a/dlls/wined3d/wined3d_private.h
+++ b/dlls/wined3d/wined3d_private.h
@@ -1184,6 +1184,7 @@ const char* debug_d3dformat(WINED3DFORMAT fmt);
 const char* debug_d3ddevicetype(D3DDEVTYPE devtype);
 const char* debug_d3dresourcetype(WINED3DRESOURCETYPE res);
 const char* debug_d3dusage(DWORD usage);
+const char* debug_d3ddeclusage(BYTE usage);
 const char* debug_d3dprimitivetype(D3DPRIMITIVETYPE PrimitiveType);
 const char* debug_d3drenderstate(DWORD state);
 const char* debug_d3dsamplerstate(DWORD state);