diff --git a/src/gdb_main.c b/src/gdb_main.c
index 33a37eef027..62fb78784c3 100644
--- a/src/gdb_main.c
+++ b/src/gdb_main.c
@@ -744,7 +744,7 @@ static void handle_v_packet(char *packet, const size_t plen)
 		/* Write Flash Memory */
 		const uint32_t count = plen - bin;
 		DEBUG_GDB("Flash Write %08" PRIX32 " %08" PRIX32 "\n", addr, count);
-		if (cur_target && target_flash_write(cur_target, addr, (void *)packet + bin, count))
+		if (cur_target && target_flash_write(cur_target, addr, (uint8_t *)packet + bin, count))
 			gdb_putpacketz("OK");
 		else {
 			target_flash_complete(cur_target);
diff --git a/src/rtt.c b/src/rtt.c
index e3e35086c2d..df5f0ef504d 100644
--- a/src/rtt.c
+++ b/src/rtt.c
@@ -275,7 +275,7 @@ uint32_t rtt_aligned_mem_read(target_s *t, void *dest, target_addr_t src, size_t
 		return target_mem_read(t, dest, src, len);
 
 	const uint32_t retval = target_mem_read(t, dest, src0, len0);
-	memmove(dest, dest + offset, len);
+	memmove(dest, (uint8_t *)dest + offset, len);
 	return retval;
 }
 
diff --git a/src/target/ch32f1.c b/src/target/ch32f1.c
index 98398d1bbd5..79f331f73ed 100644
--- a/src/target/ch32f1.c
+++ b/src/target/ch32f1.c
@@ -279,7 +279,7 @@ static bool ch32f1_wait_flash_ready(target_s *t, uint32_t addr)
 }
 
 /* Fast flash for ch32. Load 128 bytes chunk and then write them */
-static int ch32f1_upload(target_s *t, uint32_t dest, const void *src, uint32_t offset)
+static int ch32f1_upload(target_s *t, uint32_t dest, const uint8_t *src, uint32_t offset)
 {
 	volatile uint32_t sr, magic;
 	const uint32_t *ss = (const uint32_t *)(src + offset);
@@ -319,7 +319,7 @@ static bool ch32f1_flash_write(target_flash_s *f, target_addr_t dest, const void
 	size_t length = len;
 #ifdef CH32_VERIFY
 	target_addr_t org_dest = dest;
-	const void *org_src = src;
+	const uint8_t *org_src = (const uint8_t *)src;
 #endif
 	DEBUG_INFO("CH32: flash write 0x%" PRIx32 " ,size=%" PRIu32 "\n", dest, (uint32_t)len);
 
@@ -337,7 +337,7 @@ static bool ch32f1_flash_write(target_flash_s *f, target_addr_t dest, const void
 			return false;
 
 		for (size_t i = 0; i < 8U; i++) {
-			if (ch32f1_upload(t, dest, src, i * 16U)) {
+			if (ch32f1_upload(t, dest, (const uint8_t *)src, i * 16U)) {
 				DEBUG_ERROR("Cannot upload to buffer\n");
 				return false;
 			}
@@ -359,7 +359,7 @@ static bool ch32f1_flash_write(target_flash_s *f, target_addr_t dest, const void
 		else
 			length = 0;
 		dest += 128U;
-		src += 128U;
+		src = (const uint8_t *)src + 128U;
 
 		sr = target_mem_read32(t, FLASH_SR); // 13
 		ch32f1_flash_lock(t);
diff --git a/src/target/kinetis.c b/src/target/kinetis.c
index 1e5c5853772..f737c4ab94d 100644
--- a/src/target/kinetis.c
+++ b/src/target/kinetis.c
@@ -473,7 +473,7 @@ static bool kinetis_flash_cmd_write(target_flash_s *f, target_addr_t dest, const
 		else
 			len = 0;
 		dest += kf->write_len;
-		src += kf->write_len;
+		src = (const uint8_t *)src + kf->write_len;
 	}
 
 	return true;
diff --git a/src/target/renesas.c b/src/target/renesas.c
index e83e3fd02e4..116978b103f 100644
--- a/src/target/renesas.c
+++ b/src/target/renesas.c
@@ -596,7 +596,7 @@ static bool renesas_rv40_flash_write(target_flash_s *const f, target_addr_t dest
 			target_mem_write16(t, RV40_CMD, *(uint16_t *)src);
 
 			/* 2 bytes of data */
-			src += 2U;
+			src = (const uint8_t *)src + 2U;
 		}
 
 		/* Issue write end command */
diff --git a/src/target/target.c b/src/target/target.c
index 8a162e6d66d..e90a9cd9262 100644
--- a/src/target/target.c
+++ b/src/target/target.c
@@ -313,7 +313,7 @@ void target_regs_read(target_s *t, void *data)
 		t->regs_read(t, data);
 	else {
 		for (size_t x = 0, i = 0; x < t->regs_size;)
-			x += target_reg_read(t, i++, data + x, t->regs_size - x);
+			x += target_reg_read(t, i++, (uint8_t *)data + x, t->regs_size - x);
 	}
 }
 
@@ -323,7 +323,7 @@ void target_regs_write(target_s *t, const void *data)
 		t->regs_write(t, data);
 	else {
 		for (size_t x = 0, i = 0; x < t->regs_size;)
-			x += target_reg_write(t, i++, data + x, t->regs_size - x);
+			x += target_reg_write(t, i++, (const uint8_t *)data + x, t->regs_size - x);
 	}
 }
 
diff --git a/src/target/target_flash.c b/src/target/target_flash.c
index bacd19a1c51..f20b7042d1b 100644
--- a/src/target/target_flash.c
+++ b/src/target/target_flash.c
@@ -213,7 +213,7 @@ static bool flash_buffered_flush(target_flash_s *flash)
 	return result;
 }
 
-static bool flash_buffered_write(target_flash_s *flash, target_addr_t dest, const void *src, size_t len)
+static bool flash_buffered_write(target_flash_s *flash, target_addr_t dest, const uint8_t *src, size_t len)
 {
 	bool result = true; /* Catch false returns with &= */
 	while (len) {
@@ -292,7 +292,7 @@ bool target_flash_write(target_s *target, target_addr_t dest, const void *src, s
 		}
 
 		dest = local_end_addr;
-		src += local_length;
+		src = (const uint8_t *)src + local_length;
 		len -= local_length;
 	}
 	return result;
diff --git a/src/target/target_internal.h b/src/target/target_internal.h
index b108d964b1a..ff932b954ea 100644
--- a/src/target/target_internal.h
+++ b/src/target/target_internal.h
@@ -65,7 +65,7 @@ struct target_flash {
 	flash_erase_func erase;      /* Erase a range of flash */
 	flash_write_func write;      /* Write to flash */
 	flash_done_func done;        /* Finish flash operations */
-	void *buf;                   /* Buffer for flash operations */
+	uint8_t *buf;                /* Buffer for flash operations */
 	target_addr_t buf_addr_base; /* Address of block this buffer is for */
 	target_addr_t buf_addr_low;  /* Address of lowest byte written */
 	target_addr_t buf_addr_high; /* Address of highest byte written */