diff --git a/geojson.c b/geojson.c
index 675384c..03317e5 100644
--- a/geojson.c
+++ b/geojson.c
@@ -526,6 +526,8 @@ next_feature:
 	tile2latlon(file_bbox[2], file_bbox[3], 32, &minlat, &maxlon);
 
 	mbtiles_write_metadata(outdb, fname, layername, minzoom, maxzoom, minlat, minlon, maxlat, maxlon, midlat, midlon, &file_keys);
+
+	pool_free_strings(&file_keys);
 }
 
 int main(int argc, char **argv) {
diff --git a/mbtiles.c b/mbtiles.c
index 036a748..cc65768 100644
--- a/mbtiles.c
+++ b/mbtiles.c
@@ -202,6 +202,7 @@ void mbtiles_write_metadata(sqlite3 *outdb, char *fname, char *layername, int mi
 		exit(EXIT_FAILURE);
 	}
 	sqlite3_free(sql);
+	free(buf);
 }
 
 void mbtiles_close(sqlite3 *outdb, char **argv) {
diff --git a/pool.c b/pool.c
index 830e9f4..015d93c 100644
--- a/pool.c
+++ b/pool.c
@@ -84,8 +84,12 @@ struct pool_val *pool_long_long(struct pool *p, long long *s, int type) {
 	return pool1(p, (char *) s, type, llcmp);
 }
 
-void pool_free(struct pool *p) {
+void pool_free1(struct pool *p, void (*func)(void *)) {
 	while (p->head != NULL) {
+		if (func != NULL) {
+			func(p->head->s);
+		}
+
 		struct pool_val *next = p->head->next;
 		free(p->head);
 		p->head = next;
@@ -96,6 +100,14 @@ void pool_free(struct pool *p) {
 	p->vals = NULL;
 }
 
+void pool_free(struct pool *p) {
+	pool_free1(p, NULL);
+}
+
+void pool_free_strings(struct pool *p) {
+	pool_free1(p, free);
+}
+
 void pool_init(struct pool *p, int n) {
 	p->n = n;
 	p->vals = NULL;
diff --git a/pool.h b/pool.h
index 383b252..07f1491 100644
--- a/pool.h
+++ b/pool.h
@@ -21,5 +21,6 @@ struct pool {
 struct pool_val *pool(struct pool *p, char *s, int type);
 struct pool_val *pool_long_long(struct pool *p, long long *val, int type);
 void pool_free(struct pool *p);
+void pool_free_strings(struct pool *p);
 void pool_init(struct pool *p, int n);
 int is_pooled(struct pool *p, char *s, int type);