diff --git a/library/stdlib_memory.h b/library/stdlib_memory.h
index 177243a..9dda55c 100644
--- a/library/stdlib_memory.h
+++ b/library/stdlib_memory.h
@@ -60,21 +60,10 @@
 
 /****************************************************************************/
 
-/*
- * Uncomment this to make all memory allocation operations return addresses
- * which are aligned to a multiple of MEM_BLOCKSIZE (see <exec/memory.h>).
- * This renders them 64 bit aligned which can be useful for floating point
- * numbers in data structures used by the PowerPC. You pay for this privilege
- * by spending an additional 4 bytes per allocation.
- */
-#define __MEM_ALLOCATIONS_64_BIT_ALIGNED
-
-/****************************************************************************/
-
 /*
  * Uncomment this to enable the slab allocator.
  */
-#define __USE_SLAB_ALLOCATOR
+/*#define __USE_SLAB_ALLOCATOR*/
 
 /****************************************************************************/
 
@@ -178,7 +167,7 @@ struct MemoryNode
 	struct MinNode		mn_MinNode;
 
 	UBYTE				mn_AlreadyFree;
-	UBYTE				mn_Pad0[7];			/* Note: provide 64 bit alignment */
+	UBYTE				mn_Pad0[3];
 
 	void *				mn_Allocation;
 	size_t				mn_AllocationSize;
@@ -199,10 +188,6 @@ struct MemoryNode
 
 #endif /* __MEM_DEBUG */
 
-#ifdef __MEM_ALLOCATIONS_64_BIT_ALIGNED
-	ULONG				mn_Alignment;
-#endif /* __MEM_ALLOCATIONS_64_BIT_ALIGNED */
-
 	ULONG				mn_Size;
 };
 
@@ -267,9 +252,6 @@ struct SlabNode
 struct SlabSingleAllocation
 {
 	struct MinNode	ssa_MinNode;
-#ifdef __MEM_ALLOCATIONS_64_BIT_ALIGNED
-	ULONG			ssa_Alignment;
-#endif /* __MEM_ALLOCATIONS_64_BIT_ALIGNED */
 	ULONG			ssa_Size;
 };