diff --git a/ionc/ion_allocation.c b/ionc/ion_allocation.c
index af10781..f28db06 100644
--- a/ionc/ion_allocation.c
+++ b/ionc/ion_allocation.c
@@ -179,7 +179,7 @@ ION_ALLOCATION_CHAIN *_ion_alloc_block(SIZE min_needed)
     SIZE                  alloc_size = min_needed + ALIGN_SIZE(sizeof(ION_ALLOCATION_CHAIN)); // subtract out the block[1]
 
     new_block = (ION_ALLOCATION_CHAIN *)ion_xalloc(alloc_size);    
-    memset(new_block, 0, sizeof(*new_block));
+    memset(new_block, 0, alloc_size);
     new_block->size = alloc_size;
     
     // see if we suceeded