Fix a compiler warning from a khronos prototype change.epoxy

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/tests/spec/arb_debug_output/api_error.c b/tests/spec/arb_debug_output/api_error.c
index 8f00b1cfc..5e2bddcb3 100644
--- a/tests/spec/arb_debug_output/api_error.c
+++ b/tests/spec/arb_debug_output/api_error.c
@@ -49,7 +49,7 @@ static void GLAPIENTRY debug_callback(GLenum source,
                                       GLenum severity,
                                       GLsizei length,
                                       const GLchar* message,
-                                      GLvoid* userParam)
+                                      const GLvoid* userParam)
 {
    if (source != GL_DEBUG_SOURCE_API_ARB) {
       puts("source isn't API");