diff --git a/src/conversionOfNumbers/conversionOfNumbers.c b/src/conversionOfNumbers/conversionOfNumbers.c
index 456801d..305d0ad 100644
--- a/src/conversionOfNumbers/conversionOfNumbers.c
+++ b/src/conversionOfNumbers/conversionOfNumbers.c
@@ -51,7 +51,7 @@ unsigned int convertBinaryStrToInt(char* input){
     return result;
 }
 
-int hexStrLen(int input){
+int hexStrLen(const int input){
     int length = 0;
     if(input == 0) return 1;
     for (int x = 0; x <= input; x++){
diff --git a/src/conversionOfNumbers/conversionOfNumbers.h b/src/conversionOfNumbers/conversionOfNumbers.h
index b897a66..d8ec7ce 100644
--- a/src/conversionOfNumbers/conversionOfNumbers.h
+++ b/src/conversionOfNumbers/conversionOfNumbers.h
@@ -5,6 +5,6 @@ char* convertIntToBinaryStr(int input);
 int binaryStrLen(int input);
 unsigned int convertBinaryStrToInt(char* input);
 char* convertIntToHex(int input);
-int hexStrLen(int input);
+int hexStrLen(const int input);
 
 #endif
\ No newline at end of file