diff --git a/tests/test-mshared.c b/tests/test-mshared.c
index 5b5fdf02..63411fb2 100644
--- a/tests/test-mshared.c
+++ b/tests/test-mshared.c
@@ -130,11 +130,13 @@ static void test2(void)
   shared_int_clear(p1);
 }
 
+#define MAX_RESSOURCE 10
+
 static void test_ressource(int n)
 {
   shared_ressource_t ressource;
-  shared_ressource_it_t it[n];
-  shared_ressource_it_t copy[n];
+  shared_ressource_it_t it[MAX_RESSOURCE];
+  shared_ressource_it_t copy[MAX_RESSOURCE];
   shared_ressource_it_t onemore;
   
   shared_ressource_init (ressource, n);
@@ -180,7 +182,7 @@ int main(void)
 {
   test1();
   test2();
-  for(int i = 1; i < 10; i++)
+  for(int i = 1; i < MAX_RESSOURCE; i++)
     test_ressource(i);  
   exit(0);
 }
diff --git a/tests/test-msnapshot.c b/tests/test-msnapshot.c
index 9cb8225c..3333a366 100644
--- a/tests/test-msnapshot.c
+++ b/tests/test-msnapshot.c
@@ -241,10 +241,13 @@ static void prod2(void *arg)
   assert (p != NULL);
 }
 
+#define MAX_WRITER 8
+#define MAX_READER 8
+
 static void test_mrsw_global(int reader)
 {
   m_thread_t idx_w;
-  m_thread_t idx[reader];
+  m_thread_t idx[MAX_READER];
 
   snapshot_mrsw_data_init(global_mrsw, reader);
   data_t *p = snapshot_mrsw_data_write(global_mrsw);
@@ -298,8 +301,8 @@ static void prod3(void *arg)
 
 static void test_mrmw_global(int reader, int writer)
 {
-  m_thread_t idx_w[writer];
-  m_thread_t idx[reader];
+  m_thread_t idx_w[MAX_WRITER];
+  m_thread_t idx[MAX_READER];
 
   snapshot_mrmw_data_init(global_mrmw, reader, writer);
   data_t *p = snapshot_mrmw_data_write_start(global_mrmw);
@@ -330,7 +333,7 @@ int main(void)
   test_mrsw_global(1);
   test_mrsw_global(2);
   test_mrsw_global(4);
-  test_mrsw_global(8);
+  test_mrsw_global(MAX_READER);
   exit(0);
 }