diff --git a/cogl/cogl-pipeline.c b/cogl/cogl-pipeline.c
index 80d089770..4dd369c0d 100644
--- a/cogl/cogl-pipeline.c
+++ b/cogl/cogl-pipeline.c
@@ -5513,7 +5513,6 @@ _cogl_pipeline_set_static_breadcrumb (CoglPipeline *pipeline,
 
 typedef struct _HashState
 {
-  unsigned long pipeline_differences;
   unsigned long layer_differences;
   CoglPipelineEvalFlags flags;
   unsigned int hash;