diff --git a/src/pulsecore/sample-util.c b/src/pulsecore/sample-util.c
index f2017aa81..38201b232 100644
--- a/src/pulsecore/sample-util.c
+++ b/src/pulsecore/sample-util.c
@@ -721,6 +721,7 @@ void pa_volume_memchunk(
 
     pa_assert(c);
     pa_assert(spec);
+    pa_assert(pa_sample_spec_valid(spec));
     pa_assert(pa_frame_aligned(c->length, spec));
     pa_assert(volume);
 
@@ -735,11 +736,6 @@ void pa_volume_memchunk(
         return;
     }
 
-    if (spec->format < 0 || spec->format >= PA_SAMPLE_MAX) {
-      pa_log_warn("Unable to change volume of format");
-      return;
-    }
-
     do_volume = pa_get_volume_func(spec->format);
     pa_assert(do_volume);