diff --git a/Mac/Modules/cf/_CFmodule.c b/Mac/Modules/cf/_CFmodule.c
index 3f4d4f2..0904ae1 100644
--- a/Mac/Modules/cf/_CFmodule.c
+++ b/Mac/Modules/cf/_CFmodule.c
@@ -1828,6 +1828,7 @@
 	    if (!PyArg_Parse(v, "es", "ascii", &cStr))
 	        return 0;
 	        *p_itself = CFStringCreateWithCString((CFAllocatorRef)NULL, cStr, kCFStringEncodingASCII);
+		PyMem_Free(cStr);
 	        return 1;
 	}
 	if (PyUnicode_Check(v)) {
diff --git a/Mac/Modules/cf/cfsupport.py b/Mac/Modules/cf/cfsupport.py
index 800581a..c10a85e 100644
--- a/Mac/Modules/cf/cfsupport.py
+++ b/Mac/Modules/cf/cfsupport.py
@@ -429,6 +429,7 @@
             if (!PyArg_Parse(v, "es", "ascii", &cStr))
                 return NULL;
                 *p_itself = CFStringCreateWithCString((CFAllocatorRef)NULL, cStr, kCFStringEncodingASCII);
+                PyMem_Free(cStr);
                 return 1;
         }
         if (PyUnicode_Check(v)) {
diff --git a/Mac/Modules/cf/pycfbridge.c b/Mac/Modules/cf/pycfbridge.c
index ae9e128..06700b3 100644
--- a/Mac/Modules/cf/pycfbridge.c
+++ b/Mac/Modules/cf/pycfbridge.c
@@ -285,6 +285,7 @@
 		if (!PyArg_Parse(src, "es", "ascii", &chars))
 			return 0; /* This error is more descriptive than the general one below */
 		*dst = CFStringCreateWithCString((CFAllocatorRef)NULL, chars, kCFStringEncodingASCII);
+		PyMem_Free(chars);
 		return 1;
 	}
 	if (PyUnicode_Check(src)) {