diff --git a/libs/spandsp/src/spandsp/fast_convert.h b/libs/spandsp/src/spandsp/fast_convert.h
index a8170818cd..b6520c5724 100644
--- a/libs/spandsp/src/spandsp/fast_convert.h
+++ b/libs/spandsp/src/spandsp/fast_convert.h
@@ -403,7 +403,7 @@ extern "C"
        the accuracy issues related to changing the rounding scheme are of little concern
        to us. */
 
-    #if !defined(__sgi)  &&  !defined(__sunos)  &&  !defined(__solaris)
+    #if !defined(__sgi)  &&  !defined(__sunos)  &&  !defined(__solaris) && !defined(__sun)
         #warning "No usable lrint() and lrintf() functions available."
         #warning "Replacing these functions with a simple C cast."
     #endif