diff --git a/trace-events b/trace-events
index 20821ba545..22133dfd3f 100644
--- a/trace-events
+++ b/trace-events
@@ -149,7 +149,7 @@ vcpu guest_cpu_reset(void)
 # Access information can be parsed as:
 #
 # struct mem_info {
-#     uint8_t size_shift : 2; /* interpreted as "1 << size_shift" bytes */
+#     uint8_t size_shift : 4; /* interpreted as "1 << size_shift" bytes */
 #     bool    sign_extend: 1; /* sign-extended */
 #     uint8_t endianness : 1; /* 0: little, 1: big */
 #     bool    store      : 1; /* wheter it's a store operation */
diff --git a/trace/mem-internal.h b/trace/mem-internal.h
index 3444fbc596..1a010c1b27 100644
--- a/trace/mem-internal.h
+++ b/trace/mem-internal.h
@@ -10,10 +10,10 @@
 #ifndef TRACE__MEM_INTERNAL_H
 #define TRACE__MEM_INTERNAL_H
 
-#define TRACE_MEM_SZ_SHIFT_MASK 0x7 /* size shift mask */
-#define TRACE_MEM_SE (1ULL << 3)    /* sign extended (y/n) */
-#define TRACE_MEM_BE (1ULL << 4)    /* big endian (y/n) */
-#define TRACE_MEM_ST (1ULL << 5)    /* store (y/n) */
+#define TRACE_MEM_SZ_SHIFT_MASK 0xf /* size shift mask */
+#define TRACE_MEM_SE (1ULL << 4)    /* sign extended (y/n) */
+#define TRACE_MEM_BE (1ULL << 5)    /* big endian (y/n) */
+#define TRACE_MEM_ST (1ULL << 6)    /* store (y/n) */
 
 static inline uint8_t trace_mem_build_info(
     int size_shift, bool sign_extend, MemOp endianness, bool store)