diff --git a/ce/edit.c b/ce/edit.c
index 177029e..24b19fe 100644
--- a/ce/edit.c
+++ b/ce/edit.c
@@ -64,6 +64,8 @@ struct editor {
 static struct editor editor;
 
 static bool prepare_lines_cb (void* ctx, const char* start, size_t len) {
+  (void)ctx;
+
   struct edit_line* line = malloc (sizeof (*line));
 
   if (line == NULL)
diff --git a/ce/parser.c b/ce/parser.c
index f4e1ffd..7407da3 100644
--- a/ce/parser.c
+++ b/ce/parser.c
@@ -169,7 +169,7 @@ void parse_and_execute (struct list_node_link* tokens) {
   parser.next = get_token (tokens);
 
   while (parser.next != NULL) {
-    volatile struct ast_node* root = parse_precedence (&parser, PREC_NONE);
+    struct ast_node* root = parse_precedence (&parser, PREC_NONE);
 
     if (root != NULL) {
       struct context context;
diff --git a/generic/flags.mk b/generic/flags.mk
index 48f2724..20b5014 100644
--- a/generic/flags.mk
+++ b/generic/flags.mk
@@ -4,6 +4,7 @@ cflags += -nostdinc \
 					-fno-builtin \
 					-std=c11 \
 					-pedantic \
+					-pedantic-errors \
 					-Wall \
 					-Wextra
 
diff --git a/kernel/generic/flags.mk b/kernel/generic/flags.mk
index a6fe4df..109308b 100644
--- a/kernel/generic/flags.mk
+++ b/kernel/generic/flags.mk
@@ -4,6 +4,7 @@ cflags += -nostdinc \
 					-fno-builtin \
 					-std=c11 \
 					-pedantic \
+					-pedantic-errors \
 					-Wall \
 					-Wextra \
 					-mcmodel=kernel
diff --git a/kernel/libk/string.c b/kernel/libk/string.c
index 3905894..2d54a91 100644
--- a/kernel/libk/string.c
+++ b/kernel/libk/string.c
@@ -94,7 +94,6 @@ char* strncat (char* dest, const char* src, size_t n) {
 }
 
 void* memmove (void* dest, const void* src, unsigned int n) {
-  unsigned char isCopyRequire = 0; // flag bit
   char* pcSource = (char*)src;
   char* pcDstn = (char*)dest;
   // return if pcDstn and pcSource is NULL
diff --git a/kernel/proc/proc.c b/kernel/proc/proc.c
index 41bcb87..b342dd7 100644
--- a/kernel/proc/proc.c
+++ b/kernel/proc/proc.c
@@ -35,8 +35,6 @@
 static struct rb_node_link* proc_tree = NULL;
 static spin_lock_t proc_tree_lock = SPIN_LOCK_INIT;
 
-static atomic_int sched_cycles = 0;
-
 static struct id_alloc pid_alloc;
 
 int proc_alloc_pid (void) { return id_alloc (&pid_alloc); }
@@ -237,8 +235,6 @@ static struct proc* proc_find_sched (struct cpu* cpu) {
 }
 
 void proc_sched (void) {
-  int s_cycles = atomic_fetch_add (&sched_cycles, 1);
-
   struct proc* next = NULL;
   struct cpu* cpu = thiscpu;
 
@@ -297,7 +293,7 @@ void proc_wait_for (struct proc* proc, struct reschedule_ctx* rctx, struct proc*
 }
 
 static void proc_irq_sched (void* arg, void* regs, struct reschedule_ctx* rctx) {
-  (void)arg, (void)regs;
+  (void)arg, (void)regs, (void)rctx;
 
 #if defined(__x86_64__)
   struct saved_regs* sr = regs;
diff --git a/kernel/proc/procgroup.c b/kernel/proc/procgroup.c
index 4c91c61..c03f40c 100644
--- a/kernel/proc/procgroup.c
+++ b/kernel/proc/procgroup.c
@@ -203,8 +203,6 @@ static void procgroup_delete (struct procgroup* procgroup, struct reschedule_ctx
   spin_unlock (&procgroup->lock);
   spin_unlock (&procgroup_tree_lock);
 
-  struct list_node_link* resource_delete_list = NULL;
-
   /* delete resources */
   struct rb_node_link* rnode;
   rbtree_first (&procgroup->resource_tree, rnode);
diff --git a/libstring/string.c b/libstring/string.c
index 8775ceb..be49330 100644
--- a/libstring/string.c
+++ b/libstring/string.c
@@ -120,7 +120,6 @@ int isblank (int c) { return (c == ' ' || c == '\t'); }
 
 /* SOURCE: https://aticleworld.com/memmove-function-implementation-in-c/ */
 void* memmove (void* dest, const void* src, unsigned int n) {
-  unsigned char isCopyRequire = 0; // flag bit
   char* pcSource = (char*)src;
   char* pcDstn = (char*)dest;
   // return if pcDstn and pcSource is NULL