diff --git a/src/glx/glxext.c b/src/glx/glxext.c
index e55c1c17841..ef1e7ad2c8b 100644
--- a/src/glx/glxext.c
+++ b/src/glx/glxext.c
@@ -374,6 +374,8 @@ __glXInitializeVisualConfigFromTags(struct glx_config * config, int count,
 #endif
    }
 
+   config->sRGBCapable = GL_FALSE;
+
    /*
     ** Additional properties may be in a list at the end
     ** of the reply.  They are in pairs of property type