diff --git a/src/interpreter/memory.rs b/src/interpreter/memory.rs
index 171c3ab..c6a9a0d 100644
--- a/src/interpreter/memory.rs
+++ b/src/interpreter/memory.rs
@@ -49,12 +49,9 @@ impl MemoryInstance {
 			.ok_or(Error::Memory(format!("initial memory size must be at most {} pages", LINEAR_MEMORY_MAX_PAGES)))?;
 
 		let memory = MemoryInstance {
-			buffer: RwLock::new(Vec::with_capacity(initial_size as usize)),
+			buffer: RwLock::new(vec![0; initial_size as usize]),
 			maximum_size: maximum_size,
 		};
-		if memory.grow(memory_type.limits().initial())? == u32::MAX {
-			return Err(Error::Memory(format!("error initializing {}-bytes linear memory region", initial_size)));
-		}
 
 		Ok(Arc::new(memory))
 	}