diff --git a/backend/2of5.c b/backend/2of5.c
index bf1805d5..01f799bf 100644
--- a/backend/2of5.c
+++ b/backend/2of5.c
@@ -64,8 +64,6 @@ int matrix_two_of_five(struct zint_symbol *symbol, unsigned char source[], int l
     int i, error_number;
     char dest[512]; /* 6 + 80 * 6 + 6 + 1 ~ 512*/
 
-    error_number = 0;
-
     if (length > 80) {
         strcpy(symbol->errtxt, "Input too long (C01)");
         return ZINT_ERROR_TOO_LONG;
@@ -97,8 +95,6 @@ int industrial_two_of_five(struct zint_symbol *symbol, unsigned char source[], i
     int i, error_number;
     char dest[512]; /* 6 + 40 * 10 + 6 + 1 */
 
-    error_number = 0;
-
     if (length > 45) {
         strcpy(symbol->errtxt, "Input too long (C03)");
         return ZINT_ERROR_TOO_LONG;
@@ -129,8 +125,6 @@ int iata_two_of_five(struct zint_symbol *symbol, unsigned char source[], int len
     int i, error_number;
     char dest[512]; /* 4 + 45 * 10 + 3 + 1 */
 
-    error_number = 0;
-
     if (length > 45) {
         strcpy(symbol->errtxt, "Input too long (C05)");
         return ZINT_ERROR_TOO_LONG;
@@ -162,8 +156,6 @@ int logic_two_of_five(struct zint_symbol *symbol, unsigned char source[], int le
     int i, error_number;
     char dest[512]; /* 4 + 80 * 6 + 3 + 1 */
 
-    error_number = 0;
-
     if (length > 80) {
         strcpy(symbol->errtxt, "Input too long (C07)");
         return ZINT_ERROR_TOO_LONG;
@@ -200,8 +192,6 @@ int interleaved_two_of_five(struct zint_symbol *symbol, const unsigned char sour
     unsigned char* temp = (unsigned char *) _alloca((length + 2) * sizeof (unsigned char));
 #endif
 
-    error_number = 0;
-
     if (length > 89) {
         strcpy(symbol->errtxt, "Input too long (C09)");
         return ZINT_ERROR_TOO_LONG;
@@ -258,8 +248,6 @@ int itf14(struct zint_symbol *symbol, unsigned char source[], int length) {
     unsigned int count;
     char localstr[16];
 
-    error_number = 0;
-
     count = 0;
 
     if (length > 13) {
@@ -302,7 +290,6 @@ int dpleit(struct zint_symbol *symbol, unsigned char source[], int length) {
     char localstr[16];
     int zeroes;
 
-    error_number = 0;
     count = 0;
     if (length > 13) {
         strcpy(symbol->errtxt, "Input wrong length (C0E)");
diff --git a/backend/code.c b/backend/code.c
index f83f2ed5..cd948938 100644
--- a/backend/code.c
+++ b/backend/code.c
@@ -112,8 +112,6 @@ int code_11(struct zint_symbol *symbol, unsigned char source[], int length) { /*
     char dest[1024]; /* 6 +  121 * 6 + 2 * 6 + 5 + 1 ~ 1024*/
     char checkstr[3];
 
-    error_number = 0;
-
     if (length > 121) {
         strcpy(symbol->errtxt, "Input too long (C20)");
         return ZINT_ERROR_TOO_LONG;
@@ -195,7 +193,6 @@ int c39(struct zint_symbol *symbol, unsigned char source[], const size_t length)
     char dest[775];
     char localstr[2] = {0};
 
-    error_number = 0;
     counter = 0;
 
     if ((symbol->option_2 < 0) || (symbol->option_2 > 1)) {
@@ -298,8 +295,6 @@ int pharmazentral(struct zint_symbol *symbol, unsigned char source[], int length
     unsigned int count, check_digit;
     char localstr[10];
 
-    error_number = 0;
-
     count = 0;
     if (length > 6) {
         strcpy(symbol->errtxt, "Input wrong length (C25)");
@@ -344,8 +339,6 @@ int ec39(struct zint_symbol *symbol, unsigned char source[], int length) {
     unsigned int i;
     int error_number;
 
-    error_number = 0;
-
     if (length > 74) {
         strcpy(symbol->errtxt, "Input too long (C28)");
         return ZINT_ERROR_TOO_LONG;
diff --git a/backend/medical.c b/backend/medical.c
index c6e4e62c..1b43b31f 100644
--- a/backend/medical.c
+++ b/backend/medical.c
@@ -64,8 +64,6 @@ int pharma_one(struct zint_symbol *symbol, unsigned char source[], int length) {
     char inter[18] = {0}; /* 131070 -> 17 bits */
     char dest[64]; /* 17 * 2 + 1 */
 
-    error_number = 0;
-
     if (length > 6) {
         strcpy(symbol->errtxt, "Input too long (C50)");
         return ZINT_ERROR_TOO_LONG;
@@ -199,7 +197,6 @@ int codabar(struct zint_symbol *symbol, unsigned char source[], int length) {
     int i, error_number;
     char dest[512];
 
-    error_number = 0;
     strcpy(dest, "");
 
     if (length > 60) { /* No stack smashing please */
diff --git a/backend/plessey.c b/backend/plessey.c
index cfb3ac45..4f3f7384 100644
--- a/backend/plessey.c
+++ b/backend/plessey.c
@@ -57,8 +57,6 @@ int plessey(struct zint_symbol *symbol, unsigned char source[], int length) {
     char dest[1024]; /* 8 + 65 * 8 + 8 * 2 + 9 + 1 ~ 1024 */
     int error_number;
 
-    error_number = 0;
-
     if (length > 65) {
         strcpy(symbol->errtxt, "Input too long (C70)");
         return ZINT_ERROR_TOO_LONG;
diff --git a/backend/rss.c b/backend/rss.c
index 688854c7..75fa75bf 100644
--- a/backend/rss.c
+++ b/backend/rss.c
@@ -1079,9 +1079,6 @@ int general_rules(char field[], char type[]) {
 
     block_count++;
 
-    for (i = 0; i < block_count; i++) {
-    }
-
     for (i = 0; i < block_count; i++) {
         current = block[1][i];
         next = (block[1][i + 1] & 0xFF);
diff --git a/backend/telepen.c b/backend/telepen.c
index 79aff4a5..7fa5d79b 100644
--- a/backend/telepen.c
+++ b/backend/telepen.c
@@ -109,7 +109,6 @@ int telepen_num(struct zint_symbol *symbol, unsigned char source[], int src_len)
     char dest[1024]; /* 14 + 60 * 14 + 14 + 14 + 1 ~ 1024 */
     unsigned char temp[64];
 
-    error_number = 0;
     count = 0;
 
     if (temp_length > 60) {