diff --git a/blockjob.c b/blockjob.c
index b3ce14c..cd4784f 100644
--- a/blockjob.c
+++ b/blockjob.c
@@ -88,7 +88,7 @@
     Error *local_err = NULL;
 
     if (!job->driver->set_speed) {
-        error_set(errp, QERR_NOT_SUPPORTED);
+        error_set(errp, QERR_UNSUPPORTED);
         return;
     }
     job->driver->set_speed(job, speed, &local_err);
diff --git a/include/qapi/qmp/qerror.h b/include/qapi/qmp/qerror.h
index 01d1d06..f5335e6 100644
--- a/include/qapi/qmp/qerror.h
+++ b/include/qapi/qmp/qerror.h
@@ -122,9 +122,6 @@
 #define QERR_MISSING_PARAMETER \
     ERROR_CLASS_GENERIC_ERROR, "Parameter '%s' is missing"
 
-#define QERR_NOT_SUPPORTED \
-    ERROR_CLASS_GENERIC_ERROR, "Not supported"
-
 #define QERR_PERMISSION_DENIED \
     ERROR_CLASS_GENERIC_ERROR, "Insufficient permission to perform this operation"
 
diff --git a/stubs/arch-query-cpu-def.c b/stubs/arch-query-cpu-def.c
index fa67895..22e0b43 100644
--- a/stubs/arch-query-cpu-def.c
+++ b/stubs/arch-query-cpu-def.c
@@ -4,6 +4,6 @@
 
 CpuDefinitionInfoList *arch_query_cpu_definitions(Error **errp)
 {
-    error_set(errp, QERR_NOT_SUPPORTED);
+    error_set(errp, QERR_UNSUPPORTED);
     return NULL;
 }