diff --git a/src/runtime/cgo/gcc_freebsd_sigaction.c b/src/runtime/cgo/gcc_freebsd_sigaction.c
index d1bf3c0b52..98b122d75e 100644
--- a/src/runtime/cgo/gcc_freebsd_sigaction.c
+++ b/src/runtime/cgo/gcc_freebsd_sigaction.c
@@ -29,7 +29,7 @@ x_cgo_sigaction(intptr_t signum, const go_sigaction_t *goact, go_sigaction_t *ol
 	int32_t ret;
 	struct sigaction act;
 	struct sigaction oldact;
-	int i;
+	size_t i;
 
 	_cgo_tsan_acquire();
 
diff --git a/src/runtime/cgo/gcc_sigaction.c b/src/runtime/cgo/gcc_sigaction.c
index 05dee2affe..e510e359fe 100644
--- a/src/runtime/cgo/gcc_sigaction.c
+++ b/src/runtime/cgo/gcc_sigaction.c
@@ -33,7 +33,7 @@ x_cgo_sigaction(intptr_t signum, const go_sigaction_t *goact, go_sigaction_t *ol
 	int32_t ret;
 	struct sigaction act;
 	struct sigaction oldact;
-	int i;
+	size_t i;
 
 	_cgo_tsan_acquire();