diff --git a/cargo-insta/src/cargo.rs b/cargo-insta/src/cargo.rs
index 3c0c9012..b5bd9a2e 100644
--- a/cargo-insta/src/cargo.rs
+++ b/cargo-insta/src/cargo.rs
@@ -128,15 +128,18 @@ impl SnapshotContainer {
                     pending_vec.sort_by_key(|pending| pending.line);
                     for (id, pending) in pending_vec.into_iter().enumerate() {
                         if let Some(new) = pending.new {
-                            snapshots.push(PendingSnapshot {
-                                id,
-                                old: pending.old,
-                                new,
-                                op: Operation::Skip,
-                                line: Some(pending.line),
-                            });
-                            patcher.add_snapshot_macro(pending.line as usize);
-                            have_new = true;
+                            if patcher.add_snapshot_macro(pending.line as usize) {
+                                snapshots.push(PendingSnapshot {
+                                    id,
+                                    old: pending.old,
+                                    new,
+                                    op: Operation::Skip,
+                                    line: Some(pending.line),
+                                });
+                                have_new = true;
+                            } else {
+                                // this is an outdated snapshot and the file changed.
+                            }
                         }
                     }
                     Some(patcher)
diff --git a/cargo-insta/src/inline.rs b/cargo-insta/src/inline.rs
index 8fdeebec..cea92b96 100644
--- a/cargo-insta/src/inline.rs
+++ b/cargo-insta/src/inline.rs
@@ -54,16 +54,17 @@ impl FilePatcher {
         Ok(())
     }
 
-    pub fn add_snapshot_macro(&mut self, line: usize) {
+    pub fn add_snapshot_macro(&mut self, line: usize) -> bool {
         match self.find_snapshot_macro(line) {
             Some(snapshot) => {
                 assert!(self
                     .inline_snapshots
                     .last()
                     .map_or(true, |x| x.end.0 <= line));
-                self.inline_snapshots.push(snapshot)
+                self.inline_snapshots.push(snapshot);
+                true
             }
-            None => panic!("Could not find snapshot in line {}", line),
+            None => false,
         }
     }