diff --git a/include/mbedtls/platform.h b/include/mbedtls/platform.h
index bba7709..9d9c529 100644
--- a/include/mbedtls/platform.h
+++ b/include/mbedtls/platform.h
@@ -121,8 +121,8 @@
 #else
 /* For size_t */
 #include <stddef.h>
-extern void * (*mbedtls_calloc)( size_t n, size_t size );
-extern void (*mbedtls_free)( void *ptr );
+extern void *mbedtls_calloc( size_t n, size_t size );
+extern void mbedtls_free( void *ptr );
 
 /**
  * \brief               This function dynamically sets the memory-management