diff --git a/examples/C/fir/Makefile b/examples/C/fir/Makefile
index c27e423a5..4e3991e46 100644
--- a/examples/C/fir/Makefile
+++ b/examples/C/fir/Makefile
@@ -5,7 +5,7 @@ $(TARGET).objdump: $(TARGET)
 	spike $(TARGET)
     
 $(TARGET): $(TARGET).c Makefile
-	riscv64-unknown-elf-gcc -o $(TARGET) -g -O2\
+	riscv64-unknown-elf-gcc -o $(TARGET) -g\
 	  -march=rv64gc -mabi=lp64d -mcmodel=medany \
 	  -nostdlib -static -lm -fno-tree-loop-distribute-patterns \
 	  -T../common/test.ld -I../common \