diff --git a/c/qrcodegen-worker.c b/c/qrcodegen-worker.c
index b41a037..51678bb 100644
--- a/c/qrcodegen-worker.c
+++ b/c/qrcodegen-worker.c
@@ -39,20 +39,24 @@ int main(void) {
 	while (true) {
 		
 		// Read data length or exit
-		int length;
-		if (scanf("%d", &length) != 1)
-			return EXIT_FAILURE;
-		if (length == -1)
-			break;
+		size_t length;
+		{
+			int temp;
+			if (scanf("%d", &temp) != 1)
+				return EXIT_FAILURE;
+			if (temp == -1)
+				break;
+			length = (size_t)temp;
+		}
 		
 		// Read data bytes
 		bool isAscii = true;
-		uint8_t *data = malloc((size_t)length * sizeof(uint8_t));
+		uint8_t *data = malloc(length * sizeof(uint8_t));
 		if (data == NULL) {
 			perror("malloc");
 			return EXIT_FAILURE;
 		}
-		for (int i = 0; i < length; i++) {
+		for (size_t i = 0; i < length; i++) {
 			int b;
 			if (scanf("%d", &b) != 1)
 			return EXIT_FAILURE;
@@ -66,9 +70,9 @@ int main(void) {
 			return EXIT_FAILURE;
 		
 		// Allocate memory for QR Code
-		int bufferLen = qrcodegen_BUFFER_LEN_FOR_VERSION(maxVersion);
-		uint8_t *qrcode     = malloc((size_t)bufferLen * sizeof(uint8_t));
-		uint8_t *tempBuffer = malloc((size_t)bufferLen * sizeof(uint8_t));
+		size_t bufferLen = (size_t)qrcodegen_BUFFER_LEN_FOR_VERSION(maxVersion);
+		uint8_t *qrcode     = malloc(bufferLen * sizeof(uint8_t));
+		uint8_t *tempBuffer = malloc(bufferLen * sizeof(uint8_t));
 		if (qrcode == NULL || tempBuffer == NULL) {
 			perror("malloc");
 			return EXIT_FAILURE;
@@ -77,20 +81,20 @@ int main(void) {
 		// Try to make QR Code symbol
 		bool ok;
 		if (isAscii) {
-			char *text = malloc((size_t)(length + 1) * sizeof(char));
+			char *text = malloc((length + 1) * sizeof(char));
 			if (text == NULL) {
 				perror("malloc");
 				return EXIT_FAILURE;
 			}
-			for (int i = 0; i < length; i++)
+			for (size_t i = 0; i < length; i++)
 				text[i] = (char)data[i];
 			text[length] = '\0';
 			ok = qrcodegen_encodeText(text, tempBuffer, qrcode, (enum qrcodegen_Ecc)errCorLvl,
 				minVersion, maxVersion, (enum qrcodegen_Mask)mask, boostEcl == 1);
 			free(text);
 		} else if (length <= bufferLen) {
-			memcpy(tempBuffer, data, (size_t)length * sizeof(data[0]));
-			ok = qrcodegen_encodeBinary(tempBuffer, (size_t)length, qrcode, (enum qrcodegen_Ecc)errCorLvl,
+			memcpy(tempBuffer, data, length * sizeof(data[0]));
+			ok = qrcodegen_encodeBinary(tempBuffer, length, qrcode, (enum qrcodegen_Ecc)errCorLvl,
 				minVersion, maxVersion, (enum qrcodegen_Mask)mask, boostEcl == 1);
 		} else
 			ok = false;