diff --git a/panda/src/nativenet/time_clock.h b/panda/src/nativenet/time_clock.h
index b9e7627c23..c772491c17 100755
--- a/panda/src/nativenet/time_clock.h
+++ b/panda/src/nativenet/time_clock.h
@@ -247,7 +247,7 @@ inline std::string Time_Clock::Format(char * pFormat) const
                 *pch++ = ch1;
                 break;
             case 'N':
-                pch += sprintf(pch, "%03ld", _my_time.tv_usec / 1000);
+                pch += sprintf(pch, "%03ld", (long)(_my_time.tv_usec / 1000));
                 break;
             }
         }
@@ -295,7 +295,7 @@ inline std::string Time_Clock::FormatGmt(char * pFormat) const
                 *pch++ = ch1;
                 break;
             case 'N':
-                pch += sprintf(pch, "%03ld", _my_time.tv_usec / 1000);
+                pch += sprintf(pch, "%03ld", (long)(_my_time.tv_usec / 1000));
                 break;
             }
         }
diff --git a/panda/src/nativenet/time_span.h b/panda/src/nativenet/time_span.h
index 93b0f4b455..b3aa0215d5 100755
--- a/panda/src/nativenet/time_span.h
+++ b/panda/src/nativenet/time_span.h
@@ -372,7 +372,7 @@ inline std::string Time_Span::Format(char * pFormat) const
                 pch += sprintf(pch, "%02d", GetSeconds());
                 break;
             case 'N':
-                pch += sprintf(pch, "%03ld", _my_time.tv_usec / 1000);
+                pch += sprintf(pch, "%03ld", (long)(_my_time.tv_usec / 1000));
                 break;
             }
         } else {