diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c35bd720e9..3339dcd40c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -715,10 +715,16 @@ jobs:
       - name: v doctor
         run: |
           ./v doctor
+
       - name: Verify `v test` works
         run: |
           .\v.exe cmd/tools/test_if_v_test_system_works.v
           .\cmd\tools\test_if_v_test_system_works.exe
+
+      - name: Verify `v vlib/v/gen/c/coutput_test.v` works
+        run: |
+          .\v.exe vlib/v/gen/c/coutput_test.v
+
       - name: Make sure running TCC64 instead of TCC32
         run: ./v test .github\workflows\make_sure_ci_run_with_64bit_compiler_test.v
 
@@ -753,11 +759,16 @@ jobs:
         run: .\v.exe -o v.c cmd/v && .\thirdparty\tcc\tcc.exe -Werror -w -ladvapi32 -bt10 v.c
       - name: v doctor
         run: ./v doctor
+
       - name: Verify `v test` works
         run: |
           .\v.exe cmd/tools/test_if_v_test_system_works.v
           .\cmd\tools\test_if_v_test_system_works.exe
 
+      - name: Verify `v vlib/v/gen/c/coutput_test.v` works
+        run: |
+          .\v.exe vlib/v/gen/c/coutput_test.v
+
       - name: Make sure running TCC32 instead of TCC64
         run: ./v -stats .github\workflows\make_sure_ci_run_with_32bit_compiler_test.v
 
diff --git a/vlib/v/gen/c/coutput_test.v b/vlib/v/gen/c/coutput_test.v
index 140e6c09e6..7ba977fcdb 100644
--- a/vlib/v/gen/c/coutput_test.v
+++ b/vlib/v/gen/c/coutput_test.v
@@ -6,13 +6,14 @@ import v.util.vtest
 
 const vexe = @VEXE
 
-const vroot = @VMODROOT
+const vroot = os.real_path(@VMODROOT).replace('./', '')
 
 const testdata_folder = os.join_path(vroot, 'vlib', 'v', 'gen', 'c', 'testdata')
 
 const diff_cmd = diff.find_working_diff_command() or { '' }
 
 fn test_out_files() ? {
+	eprintln('> vroot: $vroot')
 	println(term.colorize(term.green, '> testing whether .out files match:'))
 	os.chdir(vroot)
 	output_path := os.join_path(os.temp_dir(), 'coutput', 'out')
@@ -147,7 +148,7 @@ fn normalize_panic_message(message string, vroot string) string {
 }
 
 fn vroot_relative(path string) string {
-	return path.replace(os.path_separator, '/').replace('$vroot/', '')
+	return path.replace(os.path_separator, '/').replace('$vroot/', '').replace('./', '')
 }
 
 fn ensure_compilation_succeeded(compilation os.Result) {