diff --git a/Makefile b/Makefile
index c8e8f6f..e883fe7 100644
--- a/Makefile
+++ b/Makefile
@@ -21,7 +21,7 @@ CFLAGS += -nostartfiles# 		# Do not use standard startup files
 CFLAGS += -nostdlib#			# Do not use standard libraries
 CFLAGS += -fno-builtin#			# Do not use built-in functions
 CFLAGS += -fno-common#			# Do not use common sections
-CFLAGS += -march=rv64i#			# Use RV64I ISA, i.e., integer only
+CFLAGS += -march=rv64im#		# Use RV64I ISA, i.e., integer only
 CFLAGS += -mabi=lp64#			# Use LP64 ABI, i.e., 64-bit longs and pointers, 32-bit ints
 CFLAGS += -Os#					# Optimize for size
 CFLAGS += -Wall -Wunused -O2