diff --git a/sources/custom/Application.cs b/sources/custom/Application.cs
index dd8682afae..27ef4c5c2e 100644
--- a/sources/custom/Application.cs
+++ b/sources/custom/Application.cs
@@ -45,10 +45,13 @@ namespace Gst {
 			
 		public static void Init(ref string[] argv) {
 			int cnt_argv = argv == null ? 0 : argv.Length;
-			IntPtr[] native_argv = new IntPtr [cnt_argv];
+			System.Collections.Generic.List<IntPtr> native_arg_list = new System.Collections.Generic.List<IntPtr>();
 			for (int i = 0; i < cnt_argv; i++)
-				native_argv [i] = GLib.Marshaller.StringToPtrGStrdup(argv[i]);
+				native_arg_list.Add (GLib.Marshaller.StringToPtrGStrdup(argv[i]));
+			IntPtr[] native_argv = native_arg_list.ToArray();
 			gst_init(ref cnt_argv, ref native_argv);
+			foreach (var native_arg in native_arg_list)
+				GLib.Marshaller.Free (native_arg);
 		}
 
 		[DllImport("libgstreamer-1.0-0.dll", CallingConvention = CallingConvention.Cdecl)]
@@ -66,11 +69,14 @@ namespace Gst {
 
 		public static bool InitCheck(ref string[] argv) {
 			int cnt_argv = argv == null ? 0 : argv.Length;
-			IntPtr[] native_argv = new IntPtr [cnt_argv];
+			System.Collections.Generic.List<IntPtr> native_arg_list = new System.Collections.Generic.List<IntPtr>();
 			for (int i = 0; i < cnt_argv; i++)
-				native_argv [i] = GLib.Marshaller.StringToPtrGStrdup(argv[i]);
+				native_arg_list.Add (GLib.Marshaller.StringToPtrGStrdup(argv[i]));
+			IntPtr[] native_argv = native_arg_list.ToArray();
 			IntPtr error = IntPtr.Zero;
 			bool ret = gst_init_check(ref cnt_argv, ref native_argv, out error);
+			foreach (var native_arg in native_arg_list)
+				GLib.Marshaller.Free (native_arg);
 			if (error != IntPtr.Zero) throw new GLib.GException (error);
 			return ret;
 		}
diff --git a/sources/custom/DeviceProvider.cs b/sources/custom/DeviceProvider.cs
index a8091603cc..463823d633 100644
--- a/sources/custom/DeviceProvider.cs
+++ b/sources/custom/DeviceProvider.cs
@@ -43,8 +43,11 @@ namespace Gst {
 
 		public void AddStaticMetadata(string key, string value) {
 			IntPtr native_key = GLib.Marshaller.StringToPtrGStrdup (key);
-			gst_device_provider_class_add_static_metadata(LookupGType().GetClassPtr (), native_key, GLib.Marshaller.StringToPtrGStrdup(value));
+			IntPtr native_value = GLib.Marshaller.StringToPtrGStrdup (value);
+			gst_device_provider_class_add_static_metadata(LookupGType().GetClassPtr (), native_key, native_value);
+
 			GLib.Marshaller.Free (native_key);
+			GLib.Marshaller.Free (native_value);
 		}
 
 		[DllImport("libgstreamer-1.0-0.dll", CallingConvention = CallingConvention.Cdecl)]
@@ -66,7 +69,17 @@ namespace Gst {
 		static extern void gst_device_provider_class_set_static_metadata(IntPtr klass, IntPtr longname, IntPtr classification, IntPtr description, IntPtr author);
 
 		public void SetStaticMetadata(string longname, string classification, string description, string author) {
-			gst_device_provider_class_set_static_metadata(LookupGType().GetClassPtr (), GLib.Marshaller.StringToPtrGStrdup(longname), GLib.Marshaller.StringToPtrGStrdup(classification), GLib.Marshaller.StringToPtrGStrdup(description), GLib.Marshaller.StringToPtrGStrdup(author));
+			IntPtr native_longname = GLib.Marshaller.StringToPtrGStrdup (longname);
+			IntPtr native_classification = GLib.Marshaller.StringToPtrGStrdup (classification);
+			IntPtr native_description = GLib.Marshaller.StringToPtrGStrdup (description);
+			IntPtr native_author = GLib.Marshaller.StringToPtrGStrdup (author);
+
+			gst_device_provider_class_set_static_metadata(LookupGType().GetClassPtr (), native_longname, native_classification, native_description, native_author);
+
+			GLib.Marshaller.Free (native_longname);
+			GLib.Marshaller.Free (native_classification);
+			GLib.Marshaller.Free (native_description);
+			GLib.Marshaller.Free (native_author);
 		}
 
 
diff --git a/sources/custom/Object.cs b/sources/custom/Object.cs
index d4284241a9..d0458da355 100644
--- a/sources/custom/Object.cs
+++ b/sources/custom/Object.cs
@@ -55,7 +55,8 @@ namespace Gst {
 			if (PropertyNameCache.ContainsKey (name))
 				return PropertyNameCache [name];
 
-			var ptr = g_object_class_find_property (Marshal.ReadIntPtr (Handle), GLib.Marshaller.StringToPtrGStrdup (name));
+			IntPtr native_name = GLib.Marshaller.StringToPtrGStrdup (name);
+			var ptr = g_object_class_find_property (Marshal.ReadIntPtr (Handle), native_name);
 			var result = ptr != IntPtr.Zero;
 
 			// just cache the positive results because there might
@@ -63,6 +64,7 @@ namespace Gst {
 			if (result)
 				PropertyNameCache [name] = result;
 
+			GLib.Marshaller.Free (native_name);
 			return result;
 		}