diff --git a/src/system/mtdutils/compr_rtime.cpp b/src/system/mtdutils/compr_rtime.cpp
index c8c6491e2..b3d2c387f 100644
--- a/src/system/mtdutils/compr_rtime.cpp
+++ b/src/system/mtdutils/compr_rtime.cpp
@@ -27,13 +27,14 @@ static int jffs2_rtime_compress(unsigned char *data_in, unsigned char *cpage_out
 		uint32_t *sourcelen, uint32_t *dstlen)
 {
 	short positions[256];
-	int outpos = 0;
-	int pos=0;
+	uint32_t outpos = 0;
+	uint32_t pos=0;
 
 	memset(positions,0,sizeof(positions));
 
 	while (pos < (*sourcelen) && outpos+2 <= (*dstlen)) {
-		int backpos, runlen=0;
+		uint32_t backpos;
+		int runlen=0;
 		unsigned char value;
 
 		value = data_in[pos];
diff --git a/src/system/mtdutils/mkfs.jffs2.cpp b/src/system/mtdutils/mkfs.jffs2.cpp
index 33ea6ffe0..1f81b0878 100644
--- a/src/system/mtdutils/mkfs.jffs2.cpp
+++ b/src/system/mtdutils/mkfs.jffs2.cpp
@@ -756,7 +756,7 @@ void CMkfsJFFS2::padblock(void)
 {
 	while (out_ofs % erase_block_size) {
 		full_write(out_fd, ffbuf, min(sizeof(ffbuf),
-					      erase_block_size - (out_ofs % erase_block_size)));
+					      (size_t)(erase_block_size - (out_ofs % erase_block_size))));
 	}
 }
 
@@ -868,7 +868,7 @@ void CMkfsJFFS2::create_target_filesystem(struct filesystem_entry *root)
 			}
 		} else {
 			while (out_ofs < pad_fs_size) {
-				full_write(out_fd, ffbuf, min(sizeof(ffbuf), pad_fs_size - out_ofs));
+				full_write(out_fd, ffbuf, min(sizeof(ffbuf), (size_t)(pad_fs_size - out_ofs)));
 			}
 
 		}