diff --git a/src/modules/module-pipe-sink.c b/src/modules/module-pipe-sink.c
index 10cc34150..f06d1ee69 100644
--- a/src/modules/module-pipe-sink.c
+++ b/src/modules/module-pipe-sink.c
@@ -101,9 +101,10 @@ static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offse
 
         case PA_SINK_MESSAGE_GET_LATENCY: {
             size_t n = 0;
-            int l;
 
 #ifdef FIONREAD
+            int l;
+
             if (ioctl(u->fd, FIONREAD, &l) >= 0 && l > 0)
                 n = (size_t) l;
 #endif
diff --git a/src/modules/module-pipe-source.c b/src/modules/module-pipe-source.c
index de6809333..c5eba43fc 100644
--- a/src/modules/module-pipe-source.c
+++ b/src/modules/module-pipe-source.c
@@ -105,9 +105,10 @@ static int source_process_msg(
 
         case PA_SOURCE_MESSAGE_GET_LATENCY: {
             size_t n = 0;
-            int l;
 
 #ifdef FIONREAD
+            int l;
+
             if (ioctl(u->fd, FIONREAD, &l) >= 0 && l > 0)
                 n = (size_t) l;
 #endif