diff -urN fontforge-20161012.old/fontforge/python.c fontforge-20161012/fontforge/python.c
--- fontforge-20161012.old/fontforge/python.c	2016-10-11 06:59:29.000000000 +0530
+++ fontforge-20161012/fontforge/python.c	2017-03-09 20:16:23.539059197 +0530
@@ -1010,7 +1010,7 @@
     if ( !PyArg_ParseTuple(args,"es|i", "UTF-8", &filename, &openflags ))
 return( NULL );
     locfilename = utf82def_copy(filename);
-    free(filename);
+    PyMem_Free(filename);
 
     /* The actual filename opened may be different from the one passed
      * to LoadSplineFont, so we can't report the filename on an
@@ -1037,7 +1037,7 @@
     if ( !PyArg_ParseTuple(args,"es","UTF-8",&filename) )
 return( NULL );
     locfilename = utf82def_copy(filename);
-    free(filename);
+    PyMem_Free(filename);
     ret = GetFontNames(locfilename, 1);
     free(locfilename);
     cnt = 0;
@@ -4093,7 +4093,7 @@
     if ( !PyArg_ParseTuple(args,"es","UTF-8",&filename) )
 return( NULL );
     locfilename = utf82def_copy(filename);
-    free(filename);
+    PyMem_Free(filename);
 
     pt = strrchr(locfilename,'.');
     if ( pt==NULL ) pt=locfilename;
@@ -7750,7 +7750,7 @@
     if ( !PyArg_ParseTuple(args,"es|O","UTF-8",&filename, &flags) )
 return( NULL );
     locfilename = utf82def_copy(filename);
-    free(filename);
+    PyMem_Free(filename);
 
     /* Check if the file exists and is readable */
     if ( access(locfilename,R_OK)!=0 ) {
@@ -7819,7 +7819,7 @@
     if ( !PyArg_ParseTuple(args,"es|OO","UTF-8",&filename,&foo,&bar) )
 return( NULL );
     locfilename = utf82def_copy(filename);
-    free(filename);
+    PyMem_Free(filename);
 
     pt = strrchr(locfilename,'.');
     if ( pt==NULL ) pt=locfilename;
@@ -13514,7 +13514,7 @@
 	    &to_background) )
 return( NULL );
     locfilename = utf82def_copy(filename);
-    free(filename);
+    PyMem_Free(filename);
 
     ext = strrchr(locfilename,'.');
     if ( ext==NULL ) {
@@ -13588,7 +13588,7 @@
     if ( !PyArg_ParseTuple(args,"OesO", &other, "UTF-8", &filename, &flagstuple ))
 return( NULL );
     locfilename = utf82def_copy(filename);
-    free(filename);
+    PyMem_Free(filename);
 
     if ( !PyType_IsSubtype(&PyFF_FontType, Py_TYPE(other)) ) {
 	PyErr_Format(PyExc_TypeError,"First argument must be a fontforge font");
@@ -15655,7 +15655,7 @@
 	}
     }
     locfilename = utf82def_copy(filename);
-    free(filename);
+    PyMem_Free(filename);
     if ( !GenerateScript(fv->sf,locfilename,bitmaptype,iflags,resolution,subfontdirectory,
 	    NULL,fv->normal==NULL?fv->map:fv->normal,rename_to,layer) ) {
 	PyErr_Format(PyExc_EnvironmentError, "Font generation failed");
@@ -15811,7 +15811,7 @@
     }
 
     locfilename = utf82def_copy(filename);
-    free(filename);
+    PyMem_Free(filename);
 
     if ( !WriteTTC(locfilename,head,ff_ttc,bf,iflags,layer,ittcflags)) {
 	PyErr_Format(PyExc_EnvironmentError, "Font generation failed");
@@ -15839,7 +15839,7 @@
     if ( !PyArg_ParseTuple(args,"es|s","UTF-8",&filename,&lookup_name) )
 return( NULL );
     locfilename = utf82def_copy(filename);
-    free(filename);
+    PyMem_Free(filename);
 
     if ( lookup_name!=NULL ) {
 	otl = SFFindLookup(fv->sf,lookup_name);
@@ -15879,7 +15879,8 @@
     if ( !PyArg_ParseTuple(args,"es","UTF-8",&filename) )
 return( NULL );
     locfilename = utf82def_copy(filename);
-    free(filename);
+    PyMem_Free(filename);
+
     if ( !LoadKerningDataFromMetricsFile(fv->sf,locfilename,fv->map)) {
 	PyErr_Format(PyExc_EnvironmentError, "No metrics data found");
 return( NULL );
@@ -15903,7 +15904,7 @@
 	    &preserveCrossFontKerning, &openflags) )
 return( NULL );
     locfilename = utf82def_copy(filename);
-    free(filename);
+    PyMem_Free(filename);
     sf = LoadSplineFont(locfilename,openflags);
     if ( sf==NULL ) {
 	PyErr_Format(PyExc_EnvironmentError, "No font found in file \"%s\"", locfilename);
@@ -15931,7 +15932,7 @@
     if ( !PyArg_ParseTuple(args,"des|i",&fraction,"UTF-8",&filename, &openflags) )
 return( NULL );
     locfilename = utf82def_copy(filename);
-    free(filename);
+    PyMem_Free(filename);
     sf = LoadSplineFont(locfilename,openflags);
     if ( sf==NULL ) {
 	PyErr_Format(PyExc_EnvironmentError, "No font found in file \"%s\"", locfilename);