1 files changed, 1 insertions, 1 deletions
diff --git a/src/rsfilesrc.rs b/src/rsfilesrc.rs
index dc07d2ce0..3bfacb8be 100644
--- a/src/rsfilesrc.rs
+++ b/src/rsfilesrc.rs
@@ -124,7 +124,7 @@ impl Source for FileSrc {
         }
 
         let size = {
-            let map = match buffer.map_readwrite() {
+            let mut map = match buffer.map_readwrite() {
                 None => {
                     return Err(FlowError::Error(error_msg!(SourceError::Failure,
                                                            ["Failed to map buffer"])));