diff --git a/src/core/mem_map_funcs.cpp b/src/core/mem_map_funcs.cpp
index 184296287..3e85a119f 100644
--- a/src/core/mem_map_funcs.cpp
+++ b/src/core/mem_map_funcs.cpp
@@ -48,7 +48,7 @@ inline void _Read(T &var, const u32 addr) {
         var = *((const T*)&g_fcram[addr & MEM_FCRAM_MASK]);
 
     } else {
-        _assert_msg_(MEMMAP, false, "unknown memory read @ 0x%08X", addr);
+        _assert_msg_(MEMMAP, false, "unknown Read%d @ 0x%08X", sizeof(var) * 8, addr);
     }
 }
 
@@ -109,7 +109,8 @@ inline void _Write(u32 addr, const T data) {
 
     // Error out...
     } else {
-        _assert_msg_(MEMMAP, false, "unknown memory write");
+        _assert_msg_(MEMMAP, false, "unknown Write%d 0x%08X @ 0x%08X", sizeof(data) * 8,
+            data, addr);
     }
 }