diff --git a/miniaudio.h b/miniaudio.h
index e9c25402..25604185 100644
--- a/miniaudio.h
+++ b/miniaudio.h
@@ -58015,6 +58015,13 @@ MA_API void ma_data_source_get_range_in_pcm_frames(const ma_data_source* pDataSo
 {
     const ma_data_source_base* pDataSourceBase = (const ma_data_source_base*)pDataSource;
 
+    if (pRangeBegInFrames != NULL) {
+        *pRangeBegInFrames = 0;
+    }
+    if (pRangeEndInFrames != NULL) {
+        *pRangeEndInFrames = 0;
+    }
+
     if (pDataSource == NULL) {
         return;
     }
@@ -58059,6 +58066,13 @@ MA_API void ma_data_source_get_loop_point_in_pcm_frames(const ma_data_source* pD
 {
     const ma_data_source_base* pDataSourceBase = (const ma_data_source_base*)pDataSource;
 
+    if (pLoopBegInFrames != NULL) {
+        *pLoopBegInFrames = 0;
+    }
+    if (pLoopEndInFrames != NULL) {
+        *pLoopEndInFrames = 0;
+    }
+
     if (pDataSource == NULL) {
         return;
     }