diff --git a/ompi/mca/rcache/vma/rcache_vma.c b/ompi/mca/rcache/vma/rcache_vma.c
index ac6eebd113..19e843f845 100644
--- a/ompi/mca/rcache/vma/rcache_vma.c
+++ b/ompi/mca/rcache/vma/rcache_vma.c
@@ -57,8 +57,8 @@ int mca_rcache_vma_find(struct mca_rcache_base_module_t* rcache,
     base_addr = down_align_addr(addr, mca_mpool_base_page_size_log);
     bound_addr = up_align_addr((void*) ((unsigned long) addr + size - 1), mca_mpool_base_page_size_log);
         
-    *reg = mca_rcache_vma_tree_find((mca_rcache_vma_module_t*)rcache, base_addr,
-            bound_addr); 
+    *reg = mca_rcache_vma_tree_find((mca_rcache_vma_module_t*)rcache, (unsigned char*)base_addr,
+            (unsigned char*)bound_addr); 
 
     return OMPI_SUCCESS;
 }
@@ -76,7 +76,7 @@ int mca_rcache_vma_find_all(struct mca_rcache_base_module_t* rcache,
     bound_addr = up_align_addr((void*) ((unsigned long) addr + size - 1), mca_mpool_base_page_size_log);
 
     return mca_rcache_vma_tree_find_all((mca_rcache_vma_module_t*)rcache,
-            base_addr, bound_addr, regs);
+            (unsigned char*)base_addr, (unsigned char*)bound_addr, regs);
 }
 
 int mca_rcache_vma_insert(struct mca_rcache_base_module_t* rcache,
diff --git a/ompi/mca/rcache/vma/rcache_vma_tree.c b/ompi/mca/rcache/vma/rcache_vma_tree.c
index 2372677d56..0e8301f45f 100644
--- a/ompi/mca/rcache/vma/rcache_vma_tree.c
+++ b/ompi/mca/rcache/vma/rcache_vma_tree.c
@@ -266,7 +266,7 @@ mca_mpool_base_registration_t *mca_rcache_vma_tree_find(
     mca_rcache_vma_t *vma;
     mca_rcache_vma_reg_list_item_t *item;
 
-    vma = ompi_rb_tree_find_with(&vma_rcache->rb_tree, base, 
+    vma = (mca_rcache_vma_t*)ompi_rb_tree_find_with(&vma_rcache->rb_tree, base, 
             mca_rcache_vma_tree_node_compare_search);
 
     if(!vma)
@@ -310,7 +310,7 @@ int mca_rcache_vma_tree_find_all(
     do {
         mca_rcache_vma_t *vma;
         opal_list_item_t *item;
-        vma = ompi_rb_tree_find_with(&vma_rcache->rb_tree, base,
+        vma = (mca_rcache_vma_t*)ompi_rb_tree_find_with(&vma_rcache->rb_tree, base,
                 mca_rcache_vma_tree_node_compare_closest);
 
         if(NULL == vma) {
@@ -464,7 +464,7 @@ int mca_rcache_vma_tree_delete(mca_rcache_vma_module_t* vma_rcache,
 {
     mca_rcache_vma_t *vma;
 
-    vma = ompi_rb_tree_find_with(&vma_rcache->rb_tree, reg->base, 
+    vma = (mca_rcache_vma_t*)ompi_rb_tree_find_with(&vma_rcache->rb_tree, reg->base, 
             mca_rcache_vma_tree_node_compare_search);
 
     if(!vma)