diff --git a/decode.cpp b/decode.cpp
index 5a69573..8a9f22d 100644
--- a/decode.cpp
+++ b/decode.cpp
@@ -63,7 +63,7 @@ void handle(std::string message, int z, unsigned x, unsigned y, int describe) {
 			within = 0;
 		}
 
-		layer_to_geojson(stdout, layer, z, x, y);
+		layer_to_geojson(stdout, layer, z, x, y, true);
 
 		if (describe) {
 			printf("] }\n");
diff --git a/plugin.cpp b/plugin.cpp
index ff77391..eccbfab 100644
--- a/plugin.cpp
+++ b/plugin.cpp
@@ -41,7 +41,7 @@ void *run_writer(void *a) {
 		exit(EXIT_FAILURE);
 	}
 
-	layer_to_geojson(fp, *(wa->layer), wa->z, wa->x, wa->y);
+	layer_to_geojson(fp, *(wa->layer), wa->z, wa->x, wa->y, false);
 
 	if (fclose(fp) != 0) {
 		perror("fclose output to filter");
diff --git a/write_json.cpp b/write_json.cpp
index 1a1d50d..3097135 100644
--- a/write_json.cpp
+++ b/write_json.cpp
@@ -24,11 +24,11 @@ struct lonlat {
 	}
 };
 
-void layer_to_geojson(FILE *fp, mvt_layer &layer, unsigned z, unsigned x, unsigned y) {
+void layer_to_geojson(FILE *fp, mvt_layer &layer, unsigned z, unsigned x, unsigned y, bool comma) {
 	for (size_t f = 0; f < layer.features.size(); f++) {
 		mvt_feature &feat = layer.features[f];
 
-		if (f != 0) {
+		if (comma && f != 0) {
 			fprintf(fp, ",\n");
 		}
 
diff --git a/write_json.hpp b/write_json.hpp
index 1308006..3799fce 100644
--- a/write_json.hpp
+++ b/write_json.hpp
@@ -1,2 +1,2 @@
-void layer_to_geojson(FILE *fp, mvt_layer &layer, unsigned z, unsigned x, unsigned y);
+void layer_to_geojson(FILE *fp, mvt_layer &layer, unsigned z, unsigned x, unsigned y, bool comma);
 void fprintq(FILE *f, const char *s);