diff --git a/src/mesa/program/prog_parameter.c b/src/mesa/program/prog_parameter.c
index 5c895d5d3e3..35d3e5906ad 100644
--- a/src/mesa/program/prog_parameter.c
+++ b/src/mesa/program/prog_parameter.c
@@ -204,8 +204,10 @@ _mesa_reserve_parameter_storage(struct gl_program_parameter_list *paramList,
    if (paramList->DisallowRealloc &&
        (oldNum + reserve_params > paramList->Size ||
         needSizeValues > paramList->SizeValues)) {
-      _mesa_problem(NULL, "Parameter storage reallocation disallowed. This "
-              "is a Mesa bug. Increase the reservation size in the code.");
+      _mesa_problem(NULL, "Parameter storage reallocation disallowed.\n"
+                          "This is a Mesa bug.\n"
+                          "Increase the reservation size in the code (wanted bytes %u, have %u || wanted values %u have %u).",
+                          oldNum + reserve_params, paramList->Size, needSizeValues, paramList->SizeValues);
       abort();
    }