diff --git a/src/lib/pci_ahci.c b/src/lib/pci_ahci.c
index 4fc96ebe..c25f08d7 100644
--- a/src/lib/pci_ahci.c
+++ b/src/lib/pci_ahci.c
@@ -214,8 +214,8 @@ static inline void lba_to_msf(uint8_t *buf, int lba)
 {
 	lba += 150;
 	buf[0] = (uint8_t) ((lba / 75) / 60);
-	buf[1] = (lba / 75) % 60;
-	buf[2] = lba % 75;
+	buf[1] = (uint8_t) ((lba / 75) % 60);
+	buf[2] = (uint8_t) (lba % 75);
 }
 
 /*
diff --git a/src/lib/vmm/io/vatpit.c b/src/lib/vmm/io/vatpit.c
index 1ecca357..ea84e07a 100644
--- a/src/lib/vmm/io/vatpit.c
+++ b/src/lib/vmm/io/vatpit.c
@@ -200,7 +200,7 @@ pit_update_counter(struct vatpit *vatpit, struct channel *c, bool latch)
 
 	delta_ticks = (sbinuptime() - c->now_sbt) / vatpit->freq_sbt;
 
-	lval = c->initial - delta_ticks % c->initial;
+	lval = (uint16_t) (c->initial - delta_ticks % c->initial);
 
 	if (latch) {
 		c->olbyte = 2;
diff --git a/src/lib/vmm/vmm_instruction_emul.c b/src/lib/vmm/vmm_instruction_emul.c
index 3f277c68..f80d79bb 100644
--- a/src/lib/vmm/vmm_instruction_emul.c
+++ b/src/lib/vmm/vmm_instruction_emul.c
@@ -1376,7 +1376,7 @@ emulate_bittest(void *vm, int vcpuid, uint64_t gpa, struct vie *vie,
 	 * "Range of Bit Positions Specified by Bit Offset Operands"
 	 */
 	bitmask = vie->opsize * 8 - 1;
-	bitoff = vie->immediate & bitmask;
+	bitoff = (int) (vie->immediate & bitmask);
 
 	/* Copy the bit into the Carry flag in %rflags */
 	if (val & (1UL << bitoff))