diff --git a/src/algorithms/telemetry_decoder/libs/libswiftcnav/bits.c b/src/algorithms/telemetry_decoder/libs/libswiftcnav/bits.c
index 0826c6e7f..fc1243789 100644
--- a/src/algorithms/telemetry_decoder/libs/libswiftcnav/bits.c
+++ b/src/algorithms/telemetry_decoder/libs/libswiftcnav/bits.c
@@ -72,8 +72,8 @@ u8 parity(u32 x)
 u32 getbitu(const u8 *buff, u32 pos, u8 len)
 {
     u32 bits = 0;
-
-    for (u32 i = pos; i < pos + len; i++) {
+	u32 i=0;
+    for ( i= pos; i < pos + len; i++) {
       bits = (bits << 1) +
              ((buff[i/8] >> (7 - i%8)) & 1u);
     }
@@ -117,9 +117,9 @@ void setbitu(u8 *buff, u32 pos, u32 len, u32 data)
   u32 mask = 1u << (len - 1);
 
   if (len <= 0 || 32 < len)
-    return;
-
-  for (u32 i = pos; i < pos + len; i++, mask >>= 1) {
+    return; 
+  u32 i=0;
+  for (i = pos; i < pos + len; i++, mask >>= 1) {
     if (data & mask)
       buff[i/8] |= 1u << (7 - i % 8);
     else
@@ -175,7 +175,8 @@ void bitshl(void *buf, u32 size, u32 shift)
   } else {
     /* Create an accumulator: it will hold a value of two consecutive bytes */
     u32      acc   = *src++;
-    for (u32 i = 0; i < full_bytes; ++i) {
+	u32 i=0;
+    for (i = 0; i < full_bytes; ++i) {
       acc = (acc << CHAR_BIT) | *src++;
       *dst++ = acc >> byte_shift;
     }
@@ -207,8 +208,8 @@ void bitcopy(void *dst, u32 dst_index, const void *src, u32 src_index,
 {
   u32 limit1 = count / 32;
   u32 limit2 = count % 32;
-
-  for (u32 idx = 0; idx < limit1; ++idx) {
+	u32 idx=0;
+  for (idx = 0; idx < limit1; ++idx) {
     u32 tmp = getbitu(src, src_index, 32);
     setbitu(dst, dst_index, 32, tmp);
     src_index += 32;
@@ -231,7 +232,8 @@ void bitcopy(void *dst, u32 dst_index, const void *src, u32 src_index,
 u8 count_bits_u64(u64 v, u8 bv)
 {
   u8 r = 0;
-  for (int i = 0; i < 16; i++)
+int i =0;
+  for (i = 0; i < 16; i++)
     r += bitn[(v >> (i*4)) & 0xf];
   return bv == 1 ? r : 64 - r;
 }
@@ -247,7 +249,8 @@ u8 count_bits_u64(u64 v, u8 bv)
 u8 count_bits_u32(u32 v, u8 bv)
 {
   u8 r = 0;
-  for (int i = 0; i < 8; i++)
+	int i=0;
+  for (i = 0; i < 8; i++)
     r += bitn[(v >> (i*4)) & 0xf];
   return bv == 1 ? r : 32 - r;
 }
@@ -263,7 +266,8 @@ u8 count_bits_u32(u32 v, u8 bv)
 u8 count_bits_u16(u16 v, u8 bv)
 {
   u8 r = 0;
-  for (int i = 0; i < 4; i++)
+int i =0;
+  for (i= 0; i < 4; i++)
     r += bitn[(v >> (i*4)) & 0xf];
   return bv == 1 ? r : 16 - r;
 }
@@ -279,7 +283,8 @@ u8 count_bits_u16(u16 v, u8 bv)
 u8 count_bits_u8(u8 v, u8 bv)
 {
   u8 r = 0;
-  for (int i = 0; i < 2; i++)
+int i=0;
+  for (i = 0; i < 2; i++)
     r += bitn[(v >> (i*4)) & 0xf];
   return bv == 1 ? r : 8 - r;
 }
diff --git a/src/algorithms/telemetry_decoder/libs/libswiftcnav/cnav_msg.c b/src/algorithms/telemetry_decoder/libs/libswiftcnav/cnav_msg.c
index b438c207d..5e33c4ba9 100644
--- a/src/algorithms/telemetry_decoder/libs/libswiftcnav/cnav_msg.c
+++ b/src/algorithms/telemetry_decoder/libs/libswiftcnav/cnav_msg.c
@@ -129,7 +129,9 @@ static void _cnav_rescan_preamble(cnav_v27_part_t *part)
   part->preamble_seen = false;
 
   if (part->n_decoded > GPS_CNAV_PREAMBLE_LENGTH + 1) {
-    for (size_t i = 1, j = part->n_decoded - GPS_CNAV_PREAMBLE_LENGTH;
+	size_t i=0;
+	size_t j=0;
+    for (i = 1, j = part->n_decoded - GPS_CNAV_PREAMBLE_LENGTH;
          i < j; ++i) {
       u32 c = getbitu(part->decoded, i, GPS_CNAV_PREAMBLE_LENGTH);
       if (GPS_CNAV_PREAMBLE1 == c || GPS_CNAV_PREAMBLE2 == c) {
@@ -280,7 +282,8 @@ static void _cnav_add_symbol(cnav_v27_part_t *part, u8 ch)
  */
 static void _cnav_msg_invert(cnav_v27_part_t *part)
 {
-  for (size_t i = 0; i < sizeof(part->decoded); i++) {
+  size_t i = 0;
+  for (i = 0; i < sizeof(part->decoded); i++) {
     part->decoded[i] ^= 0xFFu;
   }
 }
diff --git a/src/algorithms/telemetry_decoder/libs/libswiftcnav/edc.c b/src/algorithms/telemetry_decoder/libs/libswiftcnav/edc.c
index 422c8a05e..370304d04 100644
--- a/src/algorithms/telemetry_decoder/libs/libswiftcnav/edc.c
+++ b/src/algorithms/telemetry_decoder/libs/libswiftcnav/edc.c
@@ -91,7 +91,8 @@ static const u32 crc24qtab[256] = {
  */
 u32 crc24q(const u8 *buf, u32 len, u32 crc)
 {
-  for (u32 i = 0; i < len; i++)
+	u32 i=0;
+  for ( i= 0; i < len; i++)
     crc = ((crc << 8) & 0xFFFFFF) ^ crc24qtab[((crc >> 16) ^ buf[i]) & 0xff];
   return crc;
 }
@@ -117,7 +118,8 @@ u32 crc24q_bits(u32 crc, const u8 *buf, u32 n_bits, bool invert)
   u8  b     = 0;
   u32 shift = 8 - n_bits % 8;
 
-  for (u32 i = 0; i < n_bits / 8; ++i) {
+	u32 i=0;
+  for ( i= 0; i < n_bits / 8; ++i) {
     acc  = (acc << 8) | *buf++;
     if (invert) {
       acc ^= 0xFFu;