diff --git a/dlls/wined3d/pixelshader.c b/dlls/wined3d/pixelshader.c
index 6ff64b32115..0b42fe1b68c 100644
--- a/dlls/wined3d/pixelshader.c
+++ b/dlls/wined3d/pixelshader.c
@@ -781,6 +781,7 @@ inline static void get_register_name(const DWORD param, char* regstr, char const
     break;
     default:
         FIXME("Unhandled register name Type(%ld)\n", regtype);
+        sprintf(regstr, "unrecognized_register");
     break;
     }
 }
diff --git a/dlls/wined3d/vertexshader.c b/dlls/wined3d/vertexshader.c
index b3d17b58818..cf09e5f839d 100644
--- a/dlls/wined3d/vertexshader.c
+++ b/dlls/wined3d/vertexshader.c
@@ -698,6 +698,7 @@ inline static void vshader_program_add_param(IWineD3DVertexShaderImpl *This, con
     break;
   default:
     FIXME("Unknown reg type %ld %ld\n", regtype, reg);
+    strcat(hwLine, "unrecognized_register");
     break;
   }