diff --git a/flash.h b/flash.h
index e320ced..bfb0a49 100644
--- a/flash.h
+++ b/flash.h
@@ -56,7 +56,7 @@
 int register_shutdown(int (*function) (void *data), void *data);
 void *programmer_map_flash_region(const char *descr, uintptr_t phys_addr, size_t len);
 void programmer_unmap_flash_region(void *virt_addr, size_t len);
-void programmer_delay(int usecs);
+void programmer_delay(unsigned int usecs);
 
 #define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
 
diff --git a/flashrom.c b/flashrom.c
index 092572e..23728f6 100644
--- a/flashrom.c
+++ b/flashrom.c
@@ -485,7 +485,7 @@
 	flash->pgm->par.chip_readn(flash, buf, addr, len);
 }
 
-void programmer_delay(int usecs)
+void programmer_delay(unsigned int usecs)
 {
 	if (usecs > 0)
 		programmer_table[programmer].delay(usecs);
diff --git a/jedec.c b/jedec.c
index 10f5db9..be4782a 100644
--- a/jedec.c
+++ b/jedec.c
@@ -37,8 +37,7 @@
 	return (val ^ (val >> 1)) & 0x1;
 }
 
-static void toggle_ready_jedec_common(const struct flashctx *flash,
-				      chipaddr dst, int delay)
+static void toggle_ready_jedec_common(const struct flashctx *flash, chipaddr dst, unsigned int delay)
 {
 	unsigned int i = 0;
 	uint8_t tmp1, tmp2;
@@ -128,7 +127,7 @@
 	uint8_t id1, id2;
 	uint32_t largeid1, largeid2;
 	uint32_t flashcontent1, flashcontent2;
-	int probe_timing_enter, probe_timing_exit;
+	unsigned int probe_timing_enter, probe_timing_exit;
 
 	if (chip->probe_timing > 0)
 		probe_timing_enter = probe_timing_exit = chip->probe_timing;
@@ -245,9 +244,9 @@
 				     unsigned int pagesize, unsigned int mask)
 {
 	chipaddr bios = flash->virtual_memory;
-	int delay_us = 0;
+	unsigned int delay_us = 0;
 	if(flash->chip->probe_timing != TIMING_ZERO)
-	        delay_us = 10;
+		delay_us = 10;
 
 	/*  Issue the Sector Erase command   */
 	chip_writeb(flash, 0xAA, bios + (0x5555 & mask));
@@ -275,9 +274,9 @@
 				    unsigned int blocksize, unsigned int mask)
 {
 	chipaddr bios = flash->virtual_memory;
-	int delay_us = 0;
+	unsigned int delay_us = 0;
 	if(flash->chip->probe_timing != TIMING_ZERO)
-	        delay_us = 10;
+		delay_us = 10;
 
 	/*  Issue the Sector Erase command   */
 	chip_writeb(flash, 0xAA, bios + (0x5555 & mask));
@@ -304,9 +303,9 @@
 static int erase_chip_jedec_common(struct flashctx *flash, unsigned int mask)
 {
 	chipaddr bios = flash->virtual_memory;
-	int delay_us = 0;
+	unsigned int delay_us = 0;
 	if(flash->chip->probe_timing != TIMING_ZERO)
-	        delay_us = 10;
+		delay_us = 10;
 
 	/*  Issue the JEDEC Chip Erase command   */
 	chip_writeb(flash, 0xAA, bios + (0x5555 & mask));
diff --git a/programmer.h b/programmer.h
index d4d1f90..4f4cc02 100644
--- a/programmer.h
+++ b/programmer.h
@@ -120,7 +120,7 @@
 	void *(*map_flash_region) (const char *descr, uintptr_t phys_addr, size_t len);
 	void (*unmap_flash_region) (void *virt_addr, size_t len);
 
-	void (*delay) (int usecs);
+	void (*delay) (unsigned int usecs);
 };
 
 extern const struct programmer_entry programmer_table[];
@@ -248,10 +248,10 @@
 #endif
 
 /* udelay.c */
-void myusec_delay(int usecs);
+void myusec_delay(unsigned int usecs);
 void myusec_calibrate_delay(void);
-void internal_sleep(int usecs);
-void internal_delay(int usecs);
+void internal_sleep(unsigned int usecs);
+void internal_delay(unsigned int usecs);
 
 #if CONFIG_INTERNAL == 1
 /* board_enable.c */
@@ -655,7 +655,7 @@
 /* serprog.c */
 #if CONFIG_SERPROG == 1
 int serprog_init(void);
-void serprog_delay(int usecs);
+void serprog_delay(unsigned int usecs);
 #endif
 
 /* serial.c */
diff --git a/serprog.c b/serprog.c
index 35c4f32..5f26aea 100644
--- a/serprog.c
+++ b/serprog.c
@@ -870,7 +870,7 @@
 		sp_do_read_n(&(buf[addrm-addr]), addrm, lenm); // FIXME: return error
 }
 
-void serprog_delay(int usecs)
+void serprog_delay(unsigned int usecs)
 {
 	unsigned char buf[4];
 	msg_pspew("%s usecs=%d\n", __func__, usecs);
diff --git a/udelay.c b/udelay.c
index e3cf3e3..ee858b8 100644
--- a/udelay.c
+++ b/udelay.c
@@ -30,7 +30,7 @@
 /* loops per microsecond */
 static unsigned long micro = 1;
 
-__attribute__ ((noinline)) void myusec_delay(int usecs)
+__attribute__ ((noinline)) void myusec_delay(unsigned int usecs)
 {
 	unsigned long i;
 	for (i = 0; i < usecs * micro; i++) {
@@ -63,7 +63,7 @@
 	return timeusec;
 }
 
-static unsigned long measure_delay(int usecs)
+static unsigned long measure_delay(unsigned int usecs)
 {
 	unsigned long timeusec;
 	struct timeval start, end;
@@ -170,7 +170,7 @@
 }
 
 /* Not very precise sleep. */
-void internal_sleep(int usecs)
+void internal_sleep(unsigned int usecs)
 {
 #ifdef _WIN32
 	Sleep((usecs + 999) / 1000);
@@ -181,7 +181,7 @@
 }
 
 /* Precise delay. */
-void internal_delay(int usecs)
+void internal_delay(unsigned int usecs)
 {
 	/* If the delay is >1 s, use internal_sleep because timing does not need to be so precise. */
 	if (usecs > 1000000) {
@@ -199,7 +199,7 @@
 	get_cpu_speed();
 }
 
-void internal_delay(int usecs)
+void internal_delay(unsigned int usecs)
 {
 	udelay(usecs);
 }