diff --git a/src/iomux_select.c b/src/iomux_select.c
index 7312415..bcc3fa3 100644
--- a/src/iomux_select.c
+++ b/src/iomux_select.c
@@ -160,7 +160,7 @@ again:
     if (rc == 0) //no fd's were ready, no more work to do
         return event_cnt;
     
-    for (i = 0; rc >= 0 && i < mux->num_descriptors; i++) {
+    for (i = 0; rc > 0 && i < mux->num_descriptors; i++) {
         unsigned int events = 0;
 
         if (mux->descriptors[i] == NULL) { //callback might have deleted it