diff --git a/libctru/include/3ds/services/fs.h b/libctru/include/3ds/services/fs.h
index 511e6ce..4917f50 100644
--- a/libctru/include/3ds/services/fs.h
+++ b/libctru/include/3ds/services/fs.h
@@ -853,7 +853,7 @@ Result FSUSER_SwitchCleanupInvalidSaveData(bool enable);
  * @param idsSize Size of the IDs buffer.
  * @param ids Pointer to output IDs to.
  */
-Result FSUSER_EnumerateSystemSaveData(u32* idsWritten, u32 idsSize, u64* ids);
+Result FSUSER_EnumerateSystemSaveData(u32* idsWritten, u32 idsSize, u32* ids);
 
 /**
  * @brief Initializes a FSUSER session with an SDK version.
diff --git a/libctru/source/services/fs.c b/libctru/source/services/fs.c
index 39da042..93e3e55 100644
--- a/libctru/source/services/fs.c
+++ b/libctru/source/services/fs.c
@@ -1407,7 +1407,7 @@ Result FSUSER_SwitchCleanupInvalidSaveData(bool enable)
 	return cmdbuf[1];
 }
 
-Result FSUSER_EnumerateSystemSaveData(u32* idsWritten, u32 idsSize, u64* ids)
+Result FSUSER_EnumerateSystemSaveData(u32* idsWritten, u32 idsSize, u32* ids)
 {
 	u32 *cmdbuf = getThreadCommandBuffer();