diff --git a/vlib/v/gen/cgen.v b/vlib/v/gen/cgen.v
index e0a1c8d362..62c8d4ec0b 100644
--- a/vlib/v/gen/cgen.v
+++ b/vlib/v/gen/cgen.v
@@ -41,7 +41,7 @@ pub fn (g mut Gen) init() {
 	g.definitions.writeln(c_headers)
 	g.write_sorted_types()
 	g.write_multi_return_types()
-	g.definitions.writeln('// end of definitions')
+	g.definitions.writeln('// end of definitions #endif')
 }
 
 pub fn (g mut Gen) write_multi_return_types() {
diff --git a/vlib/v/gen/tests/1.c b/vlib/v/gen/tests/1.c
index f8791ed7dc..ce2badd70e 100644
--- a/vlib/v/gen/tests/1.c
+++ b/vlib/v/gen/tests/1.c
@@ -14,7 +14,7 @@ typedef struct {
 	int arg0;
 	string arg1;
 } multi_return_int_string;
-// end of definitions
+// end of definitions #endif
 void foo(int a);
 void User_inc_age(User u, int n);
 int get_int(string a);
diff --git a/vlib/v/gen/tests/2.c b/vlib/v/gen/tests/2.c
index 207ae3c053..4730e848de 100644
--- a/vlib/v/gen/tests/2.c
+++ b/vlib/v/gen/tests/2.c
@@ -3,7 +3,7 @@ struct User {
 };
 
 // multi return structs
-// end of definitions
+// end of definitions #endif
 int function1();
 void foo(int a);
 void init_user();
diff --git a/vlib/v/gen/tests/3.c b/vlib/v/gen/tests/3.c
index 4dc6a9547d..470b125825 100644
--- a/vlib/v/gen/tests/3.c
+++ b/vlib/v/gen/tests/3.c
@@ -4,7 +4,7 @@ struct User {
 };
 
 // multi return structs
-// end of definitions
+// end of definitions #endif
 int main() {
 	User user = (User){
 };
diff --git a/vlib/v/gen/tests/4.c b/vlib/v/gen/tests/4.c
index aa2c6e4bba..ab60ae4d15 100644
--- a/vlib/v/gen/tests/4.c
+++ b/vlib/v/gen/tests/4.c
@@ -13,7 +13,7 @@ typedef struct {
 	string arg1;
 } multi_return_int_string;
 
-// end of definitions
+// end of definitions #endif
 multi_return_int_string mr_test();
 int testa();
 string testb(int a);