diff --git a/decode.cc b/decode.cc
index 692a4be8..dc84b76e 100644
--- a/decode.cc
+++ b/decode.cc
@@ -115,7 +115,7 @@ void handle(std::string message, int z, unsigned x, unsigned y) {
 			printf("{ \"type\": \"Feature\"");
 			printf(", \"properties\": { ");
 
-			for (unsigned t = 0; t + 1 < feat.tags_size(); t += 2) {
+			for (int t = 0; t + 1 < feat.tags_size(); t += 2) {
 				if (t != 0) {
 					printf(", ");
 				}
diff --git a/geometry.cc b/geometry.cc
index 032f3887..ed27fe4c 100644
--- a/geometry.cc
+++ b/geometry.cc
@@ -331,7 +331,7 @@ static void decode_clipped(ClipperLib::PolyNode *t, drawvec &out) {
 	// to do any outer-ring children of those children as a new top level.
 
 	ClipperLib::Path p = t->Contour;
-	for (int i = 0; i < p.size(); i++) {
+	for (unsigned i = 0; i < p.size(); i++) {
 		out.push_back(draw((i == 0) ? VT_MOVETO : VT_LINETO, p[i].X, p[i].Y));
 	}
 	if (p.size() > 0) {
@@ -340,7 +340,7 @@ static void decode_clipped(ClipperLib::PolyNode *t, drawvec &out) {
 
 	for (int n = 0; n < t->ChildCount(); n++) {
 		ClipperLib::Path p = t->Childs[n]->Contour;
-		for (int i = 0; i < p.size(); i++) {
+		for (unsigned i = 0; i < p.size(); i++) {
 			out.push_back(draw((i == 0) ? VT_MOVETO : VT_LINETO, p[i].X, p[i].Y));
 		}
 		if (p.size() > 0) {