diff --git a/src/cpu/base_dyn_inst.hh b/src/cpu/base_dyn_inst.hh
index 6f9555a..de76559 100644
--- a/src/cpu/base_dyn_inst.hh
+++ b/src/cpu/base_dyn_inst.hh
@@ -221,7 +221,7 @@
     short asid;
 
     /** The size of the request */
-    uint8_t effSize;
+    unsigned effSize;
 
     /** Pointer to the data for the memory access. */
     uint8_t *memData;