diff --git a/runners/bench_defines.h b/runners/bench_defines.h
index 34863c37..b3c825af 100644
--- a/runners/bench_defines.h
+++ b/runners/bench_defines.h
@@ -90,7 +90,9 @@
     BENCH_DEFINE(NOR_PROG_WIDTH,        (DISK_SIM == 0)
                                             ? LFS3_MIN(256, BLOCK_SIZE)
                                             : BLOCK_SIZE                    )
-    BENCH_DEFINE(NOR_ERASE_WIDTH,       BLOCK_SIZE                          )
+    BENCH_DEFINE(NOR_ERASE_WIDTH,       (DISK_SIM == 0)
+                                            ? LFS3_MIN(ERASE_SIZE, BLOCK_SIZE)
+                                            : BLOCK_SIZE                    )
     BENCH_DEFINE(NOR_READ_TIMING,       (DISK_SIM == 0) ? 0     : 0         )
     BENCH_DEFINE(NOR_PROG_TIMING,       (DISK_SIM == 0) ? 1563  : 0         )
     BENCH_DEFINE(NOR_ERASE_TIMING,      (DISK_SIM == 0) ? 10986 : 0         )
@@ -128,7 +130,9 @@
     BENCH_DEFINE(NAND_PROG_WIDTH,       (DISK_SIM == 0)
                                             ? LFS3_MIN(2048, BLOCK_SIZE)
                                             : BLOCK_SIZE                    )
-    BENCH_DEFINE(NAND_ERASE_WIDTH,      BLOCK_SIZE                          )
+    BENCH_DEFINE(NAND_ERASE_WIDTH,      (DISK_SIM == 0)
+                                            ? LFS3_MIN(ERASE_SIZE, BLOCK_SIZE)
+                                            : BLOCK_SIZE                    )
     BENCH_DEFINE(NAND_READ_TIMING,      (DISK_SIM == 0) ? 12  : 0           )
     BENCH_DEFINE(NAND_PROG_TIMING,      (DISK_SIM == 0) ? 122 : 0           )
     BENCH_DEFINE(NAND_ERASE_TIMING,     (DISK_SIM == 0) ? 15  : 0           )