diff --git a/capn-malloc.c b/capn-malloc.c
index 56c8fdf..811a86a 100644
--- a/capn-malloc.c
+++ b/capn-malloc.c
@@ -172,7 +172,7 @@ capn_write_mem(struct capn *c, uint8_t *p, size_t sz, int packed)
 {
 	struct capn_segment *seg;
 	struct capn_ptr root;
-	unsigned i;
+	int i;
 	uint32_t headerlen;
 	size_t datasz;
 	uint32_t *header;
diff --git a/capn-stream.c b/capn-stream.c
index 4bc1355..6d7f397 100644
--- a/capn-stream.c
+++ b/capn-stream.c
@@ -12,7 +12,7 @@ int capn_deflate(struct capn_stream* s) {
 	}
 
 	while (s->avail_in) {
-		unsigned i, sz = 0;
+		int i, sz = 0;
 		uint8_t hdr = 0;
 		uint8_t *p;
 
@@ -104,7 +104,7 @@ int capn_inflate(struct capn_stream* s) {
 	}
 
 	while (s->avail_out) {
-		unsigned i, sz;
+		int i, sz;
 		uint8_t hdr;
 
 		if (s->zeros > 0) {