diff --git a/nsock/src/engine_select.c b/nsock/src/engine_select.c
index 39cc7e31b..41fde3489 100644
--- a/nsock/src/engine_select.c
+++ b/nsock/src/engine_select.c
@@ -78,7 +78,7 @@
     } else { \
       fatal("%s:%ld: Attempt to FD_SET fd %d, which is not less than" \
         " FD_SETSIZE (%d). Try using a lower parallelism.", \
-        __FILE__, __LINE__, (fd), FD_SETSIZE); \
+        __FILE__, (long int) __LINE__, (fd), FD_SETSIZE); \
     } \
   } while (0)
 #endif
@@ -93,7 +93,7 @@
     } else { \
       fatal("%s:%ld: Attempt to FD_CLR fd %d, which is not less than" \
         " FD_SETSIZE (%d). Try using a lower parallelism.", \
-        __FILE__, __LINE__, (fd), FD_SETSIZE); \
+        __FILE__, (long int) __LINE__, (fd), FD_SETSIZE); \
     } \
   } while (0)
 #endif
diff --git a/nsock/src/nsock_core.c b/nsock/src/nsock_core.c
index fc39ac5f5..829fe69d1 100644
--- a/nsock/src/nsock_core.c
+++ b/nsock/src/nsock_core.c
@@ -277,7 +277,7 @@ static int iod_add_event(msiod *iod, msevent *nse) {
 #endif
 
     default:
-      fatal("Unknown event type (%d) for IOD #%d\n", nse->type, iod->id);
+      fatal("Unknown event type (%d) for IOD #%lu\n", nse->type, iod->id);
   }
   return 0;
 }