diff --git a/testsuite/tests/tools/gprbuild/executable/part2/test.out b/testsuite/tests/tools/gprbuild/executable/part2/test.out
index 5b7066f1..22cc08b1 100644
--- a/testsuite/tests/tools/gprbuild/executable/part2/test.out
+++ b/testsuite/tests/tools/gprbuild/executable/part2/test.out
@@ -48,7 +48,7 @@ Hello from Dep_Two
 
 ================================================================
 Case 4 - Missing main.adb
-main.gpr:5:18: error: main.adb is not a source of project Main
+main.gpr:5:18: error: "main.adb" is not a source of project Main
 gprbuild: processing failed
 Test return value: 5
 
diff --git a/testsuite/tests/tools/gprbuild/executable/part2/test.out.win b/testsuite/tests/tools/gprbuild/executable/part2/test.out.win
index e85ce46d..44fb260d 100644
--- a/testsuite/tests/tools/gprbuild/executable/part2/test.out.win
+++ b/testsuite/tests/tools/gprbuild/executable/part2/test.out.win
@@ -48,7 +48,7 @@ Hello from Dep_Two
 
 ================================================================
 Case 4 - Missing main.adb
-main.gpr:5:18: error: main.adb is not a source of project Main
+main.gpr:5:18: error: "main.adb" is not a source of project Main
 gprbuild: processing failed
 Test return value: 5