diff --git a/gcc/testsuite/gcc.dg/20050321-1.c b/gcc/testsuite/gcc.dg/20050321-1.c
index 5455db443046..79f62a32601a 100644
--- a/gcc/testsuite/gcc.dg/20050321-1.c
+++ b/gcc/testsuite/gcc.dg/20050321-1.c
@@ -3,9 +3,7 @@
 
 /* { dg-do compile } */
 /* { dg-options "-O2 -fmodulo-sched" } */
-/* malloc doesn't take a long. */
-/* { dg-xfail-if "" { "m32c-*-*" } { "*" } { "" } } */
-extern void * malloc (long);
+extern void * malloc (__SIZE_TYPE__);
 
 struct s {
     int k;
diff --git a/gcc/testsuite/gcc.dg/pr18241-1.c b/gcc/testsuite/gcc.dg/pr18241-1.c
index f5134d317b2d..d6bdbccf8de0 100644
--- a/gcc/testsuite/gcc.dg/pr18241-1.c
+++ b/gcc/testsuite/gcc.dg/pr18241-1.c
@@ -1,9 +1,7 @@
 /* { dg-do run } */
-/* memset doesn't take unsigned long */
-/* { dg-xfail-if "" { "m32c-*-*" } { "*" } { "" } } */
 /* { dg-options "-std=gnu99 -Wall -Wextra -O1" } */ 
 
-extern void *memset (void*, int, unsigned long);
+extern void *memset (void*, int, __SIZE_TYPE__);
 extern void abort (void);
 
 struct radix_tree_root {
diff --git a/gcc/testsuite/gcc.dg/pr18241-2.c b/gcc/testsuite/gcc.dg/pr18241-2.c
index 89221247ad07..a3ff1de0f700 100644
--- a/gcc/testsuite/gcc.dg/pr18241-2.c
+++ b/gcc/testsuite/gcc.dg/pr18241-2.c
@@ -1,9 +1,7 @@
 /* { dg-do run } */
-/* memset doesn't take unsigned long */
-/* { dg-xfail-if "" { "m32c-*-*" } { "*" } { "" } } */
 /* { dg-options "-std=gnu99 -Wall -Wextra -O1" } */ 
 
-extern void *memset (void*, int, unsigned long);
+extern void *memset (void*, int, __SIZE_TYPE__);
 extern void abort (void);
 
 struct radix_tree_root {
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr23382.c b/gcc/testsuite/gcc.dg/tree-ssa/pr23382.c
index e515417076d0..6dfcf2db30aa 100644
--- a/gcc/testsuite/gcc.dg/tree-ssa/pr23382.c
+++ b/gcc/testsuite/gcc.dg/tree-ssa/pr23382.c
@@ -1,14 +1,12 @@
 /* { dg-do compile } */ 
 /* { dg-options "-O2 -fdump-tree-alias-vops" } */
-/* malloc doesn't take a long */
-/* { dg-xfail-if "" { "m32c-*-*" } { "*" } { "" } } */
 struct a
 {
   int length;
   int a1[256];
 };
 
-void *malloc(long size) __attribute__((malloc));
+void *malloc(__SIZE_TYPE__ size) __attribute__((malloc));
 
 void f(void)
 {