diff --git a/mps/test/function/127.c b/mps/test/function/127.c
index 7ab03a0f69e..8f089c6f320 100644
--- a/mps/test/function/127.c
+++ b/mps/test/function/127.c
@@ -60,11 +60,11 @@ static void alloc_back(void) {
 
 static void test(void) {
  long int i;
- long int rsize;
+ long int rsize = 0;
 
  int inramp;
 
- mycell *r, *s;
+ mycell *r = NULL, *s;
 
  cdie(mps_arena_create(&arena, mps_arena_class_vm(),
    (size_t) 1024*1024*ARENALIMIT),
diff --git a/mps/test/function/128.c b/mps/test/function/128.c
index a2c59850ee0..cbf04acb0d7 100644
--- a/mps/test/function/128.c
+++ b/mps/test/function/128.c
@@ -60,11 +60,11 @@ static void alloc_back(void) {
 
 static void test(void) {
  long int i;
- long int rsize;
+ long int rsize = 0;
 
  int inramp;
 
- mycell *r, *s;
+ mycell *r = NULL, *s;
 
  cdie(mps_arena_create(&arena, mps_arena_class_vm(),
    (size_t) 1024*1024*ARENALIMIT),
diff --git a/mps/test/function/134.c b/mps/test/function/134.c
index bc29777ddf1..8bc25359cb9 100644
--- a/mps/test/function/134.c
+++ b/mps/test/function/134.c
@@ -60,11 +60,11 @@ static void alloc_back(void) {
 
 static void test(void) {
  long int i;
- long int rsize;
+ long int rsize = 0;
 
  int inramp;
 
- mycell *r, *s;
+ mycell *r = NULL, *s;
 
  cdie(mps_arena_create(&arena, mps_arena_class_vm(),
    (size_t) 1024*1024*ARENALIMIT),
diff --git a/mps/test/function/171.c b/mps/test/function/171.c
index 3e16d32dd6f..f00de3e87be 100644
--- a/mps/test/function/171.c
+++ b/mps/test/function/171.c
@@ -60,11 +60,11 @@ static void alloc_back(void) {
 
 static void test(void) {
  long int i;
- long int rsize;
+ long int rsize = 0;
 
  int inramp;
 
- mycell *r, *s;
+ mycell *r = NULL, *s;
 
  cdie(mps_arena_create(&arena, mps_arena_class_vm(),
    (size_t) ARENALIMIT),
diff --git a/mps/test/function/215.c b/mps/test/function/215.c
index 48e7148e029..52754ab0a11 100644
--- a/mps/test/function/215.c
+++ b/mps/test/function/215.c
@@ -60,12 +60,12 @@ static void alloc_back(void) {
 
 static void test(void) {
  long int i;
- long int rsize;
+ long int rsize = 0;
  mps_message_t message;
 
  int inramp;
 
- mycell *r, *s;
+ mycell *r = NULL, *s;
 
  cdie(mps_arena_create(&arena, mps_arena_class_vm(),
    (size_t) 1024*1024*ARENALIMIT),
diff --git a/mps/test/function/223.c b/mps/test/function/223.c
index 75e14915728..ddb88115d0d 100644
--- a/mps/test/function/223.c
+++ b/mps/test/function/223.c
@@ -60,12 +60,12 @@ static void alloc_back(void) {
 
 static void test(void) {
  long int i;
- long int rsize;
+ long int rsize = 0;
  mps_message_t message;
 
  int inramp;
 
- mycell *r, *s;
+ mycell *r = NULL, *s;
 
  cdie(mps_arena_create(&arena, mps_arena_class_vm(),
    (size_t) 1024*1024*ARENALIMIT),
diff --git a/mps/test/function/227.c b/mps/test/function/227.c
index d149bbc474c..35fe35b3d02 100644
--- a/mps/test/function/227.c
+++ b/mps/test/function/227.c
@@ -58,11 +58,11 @@ static void alloc_back(void) {
 
 static void test(void) {
  long int i;
- long int rsize;
+ long int rsize = 0;
 
  int inramp;
 
- mycell *r1, *r2, *s1, *s2;
+ mycell *r1 = NULL, *r2 = NULL, *s1, *s2;
 
  cdie(mps_arena_create(&arena1, mps_arena_class_vm(),
    (size_t) 1024*1024*ARENALIMIT), "create arena");