diff --git a/src/include/PMusr.h b/src/include/PMusr.h
index e10ced40..c90696cf 100644
--- a/src/include/PMusr.h
+++ b/src/include/PMusr.h
@@ -52,6 +52,7 @@
 #define PMUSR_MSR_FILE_WRITE_ERROR      -8
 #define PMUSR_DATA_FILE_READ_ERROR      -9
 #define PMUSR_MSR_RUN_ERROR            -10
+#define PMUSR_UNSUPPORTED_FEATURE      -11
 
 #define PRUN_SINGLE_HISTO     0
 #define PRUN_SINGLE_HISTO_RRF 1