diff --git a/mubench/suite/micro/fib/build_fib.c b/mubench/suite/micro/fib/build_fib.c
index 8c5fdb1be10ab09974bc424707300cf4d2059c25..abc66938651caec13954946161346c1dddca30fc 100644
--- a/mubench/suite/micro/fib/build_fib.c
+++ b/mubench/suite/micro/fib/build_fib.c
@@ -235,9 +235,10 @@ void build_func_fib_fast(MuIRBuilder *irbuilder)
 	G(0, int32) = irbuilder->gen_sym(irbuilder, "@int32");
 	irbuilder->new_type_int(irbuilder, G(0, int32), 32);
 
-	fib = irbuilder->gen_sym(irbuilder, "@fib");
-	G(2) = irbuilder->gen_sym(irbuilder, "@__2");
-	irbuilder->new_funcsig(irbuilder, G(2), (MuTypeNode[]){G(0, int32)}, 1, (MuTypeNode[]){G(0, int32)}, 1);
+	fib = irbuilder->gen_sym(irbuilder, "@fib_f");
+	G(2) = sig_fib;
+//	G(2) = irbuilder->gen_sym(irbuilder, "@__2");
+//	irbuilder->new_funcsig(irbuilder, G(2), (MuTypeNode[]){G(0, int32)}, 1, (MuTypeNode[]){G(0, int32)}, 1);
 	irbuilder->new_func(irbuilder, fib, G(2));
 	MuID L(0, fib.__3) = irbuilder->gen_sym(irbuilder, "@fib.__3");
 	MuID L(1, fib.__3.1) = irbuilder->gen_sym(irbuilder, "@fib.__3.1");
@@ -268,7 +269,7 @@ void build_func_fib_fast(MuIRBuilder *irbuilder)
 	MuID L(15) = irbuilder->gen_sym(irbuilder, NULL);
 	MuID L(16, fib.__3.5.8) = irbuilder->gen_sym(irbuilder, "@fib.__3.5.8");
 	G(5) = irbuilder->gen_sym(irbuilder, "@__5");
-	irbuilder->new_const_int(irbuilder, G(5), G(0, int32), -1);
+	irbuilder->new_const_int(irbuilder, G(5), G(0, int32), (uint32_t)(-1));
 	irbuilder->new_binop(irbuilder, L(15), L(16, fib.__3.5.8), MU_BINOP_ADD, G(0, int32), L(13, fib.__3.5.6), G(5), MU_NO_ID);
 
 	MuID L(17) = irbuilder->gen_sym(irbuilder, NULL);
@@ -278,7 +279,7 @@ void build_func_fib_fast(MuIRBuilder *irbuilder)
 	MuID L(19) = irbuilder->gen_sym(irbuilder, NULL);
 	MuID L(20, fib.__3.5.10) = irbuilder->gen_sym(irbuilder, "@fib.__3.5.10");
 	G(6) = irbuilder->gen_sym(irbuilder, "@__6");
-	irbuilder->new_const_int(irbuilder, G(6), G(0, int32), -2);
+	irbuilder->new_const_int(irbuilder, G(6), G(0, int32), (uint32_t)(-2));
 	irbuilder->new_binop(irbuilder, L(19), L(20, fib.__3.5.10), MU_BINOP_ADD, G(0, int32), L(13, fib.__3.5.6), G(6), MU_NO_ID);
 
 	MuID L(21) = irbuilder->gen_sym(irbuilder, NULL);