diff --git a/ShapeKit/ShapeKitGeometry.mm b/ShapeKit/ShapeKitGeometry.mm
index 74d91d0..f5099a9 100644
--- a/ShapeKit/ShapeKitGeometry.mm
+++ b/ShapeKit/ShapeKitGeometry.mm
@@ -36,10 +36,16 @@ -(id)initWithWKT:(NSString *) wkt {
     self.geosGeom = GEOSWKTReader_read_r(handle, WKTReader, [wkt UTF8String]);
     GEOSWKTReader_destroy_r(handle, WKTReader);
     
-    self.geomType = [NSString stringWithUTF8String:GEOSGeomType_r(handle, geosGeom)];
-    
+    char *typeString = GEOSGeomType_r(handle, self.geosGeom);
+    self.geomType = [NSString stringWithUTF8String: typeString];
+    free(typeString);
+        
     GEOSWKTWriter *WKTWriter = GEOSWKTWriter_create_r(handle);
-    self.wktGeom = [NSString stringWithUTF8String:GEOSWKTWriter_write_r(handle, WKTWriter,geosGeom)];
+
+    char *wktString = GEOSWKTWriter_write_r(handle, WKTWriter, self.geosGeom);
+    self.wktGeom = [NSString stringWithUTF8String:wktString];
+    free(wktString);
+    
     GEOSWKTWriter_destroy_r(handle, WKTWriter);
     
     return self;
@@ -48,10 +54,18 @@ -(id)initWithWKT:(NSString *) wkt {
 
 -(id)initWithGeosGeometry:(GEOSGeometry *)geom {
     [self init];
-    geosGeom = geom;
-    self.geomType = [NSString stringWithUTF8String:GEOSGeomType_r(handle, geosGeom)];
+    self.geosGeom = geom;
+
+    char *typeString = GEOSGeomType_r(handle, self.geosGeom);
+    self.geomType = [NSString stringWithUTF8String:typeString];
+    free(typeString);
+
     GEOSWKTWriter *WKTWriter = GEOSWKTWriter_create_r(handle);
-    self.wktGeom = [NSString stringWithUTF8String:GEOSWKTWriter_write_r(handle, WKTWriter,geosGeom)];
+    
+    char *wktString = GEOSWKTWriter_write_r(handle, WKTWriter, self.geosGeom);
+    self.wktGeom = [NSString stringWithUTF8String:wktString];
+    free(wktString);
+
     GEOSWKTWriter_destroy_r(handle, WKTWriter);
     
     return self;    
@@ -189,7 +203,10 @@ -(id)initWithCoordinate:(CLLocationCoordinate2D)coordinate {
     geometry.coordinate = coordinate;
     
     GEOSWKTWriter *WKTWriter = GEOSWKTWriter_create_r(handle);
-    self.wktGeom = [NSString stringWithUTF8String:GEOSWKTWriter_write_r(handle, WKTWriter,geosGeom)];
+    char *wktString = GEOSWKTWriter_write_r(handle, WKTWriter, self.geosGeom);
+    self.wktGeom = [NSString stringWithUTF8String: wktString];
+    free(wktString);
+
     GEOSWKTWriter_destroy_r(handle, WKTWriter);
     
     return self;
@@ -266,7 +283,10 @@ -(id)initWithCoordinates:(CLLocationCoordinate2D[])coordinates count:(unsigned i
     geometry = [MKPolyline polylineWithCoordinates:coordinates count:count];
     
     GEOSWKTWriter *WKTWriter = GEOSWKTWriter_create_r(handle);
-    self.wktGeom = [NSString stringWithUTF8String:GEOSWKTWriter_write_r(handle, WKTWriter,geosGeom)];
+    char *wktString = GEOSWKTWriter_write_r(handle, WKTWriter, self.geosGeom);
+    self.wktGeom = [NSString stringWithUTF8String: wktString];
+    free(wktString);
+
     GEOSWKTWriter_destroy_r(handle, WKTWriter);
     
     return self;
@@ -343,7 +363,11 @@ -(id)initWithCoordinates:(CLLocationCoordinate2D[])coordinates count:(unsigned i
     geometry = [MKPolygon polygonWithCoordinates:coordinates count:count];
     
     GEOSWKTWriter *WKTWriter = GEOSWKTWriter_create_r(handle);
-    self.wktGeom = [NSString stringWithUTF8String:GEOSWKTWriter_write_r(handle, WKTWriter,geosGeom)];
+
+    char *wktString = GEOSWKTWriter_write_r(handle, WKTWriter, self.geosGeom);
+    self.wktGeom = [NSString stringWithUTF8String: wktString];
+    free(wktString);
+
     GEOSWKTWriter_destroy_r(handle, WKTWriter);
     
     return self;
@@ -356,4 +380,4 @@ - (void) dealloc
     [super dealloc];
 }
 
-@end
\ No newline at end of file
+@end