diff --git a/Makefile b/Makefile
index 2c3c98be..ab7eef85 100644
--- a/Makefile
+++ b/Makefile
@@ -124,6 +124,9 @@ BENCH_CFLAGS += -Wl,--wrap=malloc
 BENCH_CFLAGS += -Wl,--wrap=free
 BENCH_CFLAGS += -Wl,--wrap=realloc
 endif
+ifdef BENCH_PERBYTE
+BENCH_CFLAGS += -DBENCH_PERBYTE
+endif
 
 ifdef VERBOSE
 CODEFLAGS    += -v
@@ -193,6 +196,14 @@ TESTFLAGS  += --perf-path="$(PERF)"
 BENCHFLAGS += --perf-path="$(PERF)"
 endif
 
+# alternative bench geometries (defaults to NOR flash)
+ifdef BENCH_NOR
+BENCHFLAGS += -DDISK_GEOMETRY=0
+endif
+ifdef BENCH_NAND
+BENCHFLAGS += -DDISK_GEOMETRY=1
+endif
+
 # this is a bit of a hack, but we want to make sure the BUILDDIR
 # directory structure is correct before we run any commands
 ifneq ($(BUILDDIR),.)