diff --git a/Makefile b/Makefile
index 9090680..88130e1 100644
--- a/Makefile
+++ b/Makefile
@@ -54,7 +54,7 @@ OBJCOPY = $(TOOLPREFIX)objcopy
 OBJDUMP = $(TOOLPREFIX)objdump
 
 # CFLAGS = -fno-pic -static -fno-builtin -fno-strict-aliasing -Wall -MD -ggdb -Werror -fno-omit-frame-pointer -O
-CFLAGS = -Wall -Werror -O0 -fno-omit-frame-pointer -ggdb
+CFLAGS = -Wall -Werror -O -fno-omit-frame-pointer -ggdb
 CFLAGS += -mcmodel=medany
 CFLAGS += -ffreestanding -fno-common -nostdlib -mno-relax
 CFLAGS += -I.
diff --git a/kernel/proc.c b/kernel/proc.c
index 71d4146..c12d97e 100644
--- a/kernel/proc.c
+++ b/kernel/proc.c
@@ -402,7 +402,7 @@ scheduler(void)
 {
   struct proc *p;
   struct cpu *c = mycpu();
-  int next;
+  int next = 0;
   
   c->proc = 0;
   for(;;){