diff --git a/src/mesa/main/texstate.c b/src/mesa/main/texstate.c
index cb147fac476..9d88554d945 100644
--- a/src/mesa/main/texstate.c
+++ b/src/mesa/main/texstate.c
@@ -330,7 +330,8 @@ _mesa_ClientActiveTexture(GLenum texture)
       return;
 
    if (texUnit >= ctx->Const.MaxTextureCoordUnits) {
-      _mesa_error(ctx, GL_INVALID_ENUM, "glClientActiveTexture(texture)");
+      _mesa_error(ctx, GL_INVALID_ENUM, "glClientActiveTexture(texture=%s)",
+                  _mesa_enum_to_string(texture));
       return;
    }