diff --git a/vlib/v/gen/c/cgen.v b/vlib/v/gen/c/cgen.v
index a280086699..6205c731a6 100644
--- a/vlib/v/gen/c/cgen.v
+++ b/vlib/v/gen/c/cgen.v
@@ -822,9 +822,6 @@ static inline void __${typ.cname}_pushval($typ.cname ch, $el_stype val) {
 			.map {
 				g.type_definitions.writeln('typedef map $typ.cname;')
 			}
-			.function {
-				g.write_fn_typesymbol_declaration(typ)
-			}
 			else {
 				continue
 			}
@@ -835,6 +832,11 @@ static inline void __${typ.cname}_pushval($typ.cname ch, $el_stype val) {
 			g.write_alias_typesymbol_declaration(typ)
 		}
 	}
+	for typ in g.table.type_symbols {
+		if typ.kind == .function && typ.name !in c.builtins {
+			g.write_fn_typesymbol_declaration(typ)
+		}
+	}
 	// Generating interfaces after all the common types have been defined
 	// to prevent generating interface struct before definition of field types
 	for typ in g.table.type_symbols {
diff --git a/vlib/v/tests/fn_test.v b/vlib/v/tests/fn_test.v
index 591f6b15be..b85fb9aa4d 100644
--- a/vlib/v/tests/fn_test.v
+++ b/vlib/v/tests/fn_test.v
@@ -44,6 +44,9 @@ type F6 = fn (int, int)
 
 type F7 = fn (time.Time, int)
 
+type MyTime = time.Time
+type F8 = fn (MyTime)
+
 fn C.atoi(&byte) int
 fn C.freec(ptr voidptr)