diff --git a/packages/core/src/tools/edit.test.ts b/packages/core/src/tools/edit.test.ts
index 9143f3bd..1341fdd0 100644
--- a/packages/core/src/tools/edit.test.ts
+++ b/packages/core/src/tools/edit.test.ts
@@ -486,10 +486,10 @@ describe('EditTool', () => {
       // The default mockEnsureCorrectEdit will return 2 occurrences for 'old'
       const result = await tool.execute(params, new AbortController().signal);
       expect(result.llmContent).toMatch(
-        /Expected 1 occurrences but found 2 for old_string in file/,
+        /Expected 1 occurrence but found 2 for old_string in file/,
       );
       expect(result.returnDisplay).toMatch(
-        /Failed to edit, expected 1 occurrence\(s\) but found 2/,
+        /Failed to edit, expected 1 occurrence but found 2/,
       );
     });
 
@@ -532,7 +532,7 @@ describe('EditTool', () => {
         /Expected 3 occurrences but found 2 for old_string in file/,
       );
       expect(result.returnDisplay).toMatch(
-        /Failed to edit, expected 3 occurrence\(s\) but found 2/,
+        /Failed to edit, expected 3 occurrences but found 2/,
       );
     });
 
diff --git a/packages/core/src/tools/edit.ts b/packages/core/src/tools/edit.ts
index 2515261d..1e04ab35 100644
--- a/packages/core/src/tools/edit.ts
+++ b/packages/core/src/tools/edit.ts
@@ -257,9 +257,12 @@ Expectation for required parameters:
           raw: `Failed to edit, 0 occurrences found for old_string in ${params.file_path}. No edits made. The exact text in old_string was not found. Ensure you're not escaping content incorrectly and check whitespace, indentation, and context. Use ${ReadFileTool.Name} tool to verify.`,
         };
       } else if (occurrences !== expectedReplacements) {
+        const occurenceTerm =
+          expectedReplacements === 1 ? 'occurrence' : 'occurrences';
+
         error = {
-          display: `Failed to edit, expected ${expectedReplacements} occurrence(s) but found ${occurrences}.`,
-          raw: `Failed to edit, Expected ${expectedReplacements} occurrences but found ${occurrences} for old_string in file: ${params.file_path}`,
+          display: `Failed to edit, expected ${expectedReplacements} ${occurenceTerm} but found ${occurrences}.`,
+          raw: `Failed to edit, Expected ${expectedReplacements} ${occurenceTerm} but found ${occurrences} for old_string in file: ${params.file_path}`,
         };
       }
     } else {