diff --git a/compiler-rt/lib/builtins/negdi2.c b/compiler-rt/lib/builtins/negdi2.c
--- a/compiler-rt/lib/builtins/negdi2.c
+++ b/compiler-rt/lib/builtins/negdi2.c
@@ -17,5 +17,5 @@
 COMPILER_RT_ABI di_int __negdi2(di_int a) {
   // Note: this routine is here for API compatibility; any sane compiler
   // should expand it inline.
-  return -a;
+  return -(du_int)a;
 }
diff --git a/compiler-rt/lib/builtins/negti2.c b/compiler-rt/lib/builtins/negti2.c
--- a/compiler-rt/lib/builtins/negti2.c
+++ b/compiler-rt/lib/builtins/negti2.c
@@ -19,7 +19,7 @@
 COMPILER_RT_ABI ti_int __negti2(ti_int a) {
   // Note: this routine is here for API compatibility; any sane compiler
   // should expand it inline.
-  return -a;
+  return -(tu_int)a;
 }
 
 #endif // CRT_HAS_128BIT