diff --git a/lib/runtime-core/src/vmcalls.rs b/lib/runtime-core/src/vmcalls.rs
index 3f378300d..b77c08f61 100644
--- a/lib/runtime-core/src/vmcalls.rs
+++ b/lib/runtime-core/src/vmcalls.rs
@@ -37,6 +37,8 @@ pub unsafe extern "C" fn local_static_memory_grow(
         Err(_) => -1,
     };
 
+    println!("local static memory grow: delta {:?}, ret {}", delta, ret);
+
     ctx.internal.memory_base = (*local_memory).base;
     ctx.internal.memory_bound = (*local_memory).bound;
 
@@ -82,6 +84,8 @@ pub unsafe extern "C" fn local_dynamic_memory_grow(
         Err(_) => -1,
     };
 
+    println!("local dynamic memory grow: delta {:?}, ret {}", delta, ret);
+
     ctx.internal.memory_base = (*local_memory).base;
     ctx.internal.memory_bound = (*local_memory).bound;