diff --git a/cc/cc_test.go b/cc/cc_test.go
index 56b36df..9a9678f 100644
--- a/cc/cc_test.go
+++ b/cc/cc_test.go
@@ -2387,6 +2387,17 @@
 	}
 }
 
+func checkEquals(t *testing.T, message string, expected, actual interface{}) {
+	if !reflect.DeepEqual(actual, expected) {
+		t.Errorf(message+
+			"\nactual:   %v"+
+			"\nexpected: %v",
+			actual,
+			expected,
+		)
+	}
+}
+
 func TestLlndkHeaders(t *testing.T) {
 	ctx := testCc(t, `
 	llndk_headers {
@@ -2817,6 +2828,18 @@
 	}
 }
 
+func TestVersioningMacro(t *testing.T) {
+	for _, tc := range []struct{ moduleName, expected string }{
+		{"libc", "__LIBC_API__"},
+		{"libfoo", "__LIBFOO_API__"},
+		{"libfoo@1", "__LIBFOO_1_API__"},
+		{"libfoo-v1", "__LIBFOO_V1_API__"},
+		{"libfoo.v1", "__LIBFOO_V1_API__"},
+	} {
+		checkEquals(t, tc.moduleName, tc.expected, versioningMacroName(tc.moduleName))
+	}
+}
+
 func TestStaticExecutable(t *testing.T) {
 	ctx := testCc(t, `
 		cc_binary {
diff --git a/cc/library.go b/cc/library.go
index 6bd93f9..335b18e 100644
--- a/cc/library.go
+++ b/cc/library.go
@@ -1329,7 +1329,7 @@
 
 func versioningMacroName(moduleName string) string {
 	macroName := charsNotForMacro.ReplaceAllString(moduleName, "_")
-	macroName = strings.ToUpper(moduleName)
+	macroName = strings.ToUpper(macroName)
 	return "__" + macroName + "_API__"
 }