diff --git a/include/tools.h b/include/tools.h
index 9ea7f89dc..484b67766 100644
--- a/include/tools.h
+++ b/include/tools.h
@@ -216,5 +216,10 @@ std::map<std::string, std::string> getNetworkInterfaces();
  */
 std::string getBestPublicIp();
 
+/** Converts file size to human understandable format
+ * This function will convert a number to its equivalent size using units.
+ */
+std::string beautifyFileSize(uint64_t number);
+
 }
 #endif // KIWIX_TOOLS_H
diff --git a/src/tools/stringTools.h b/src/tools/stringTools.h
index af0527f29..14fed7574 100644
--- a/src/tools/stringTools.h
+++ b/src/tools/stringTools.h
@@ -31,7 +31,6 @@
 namespace kiwix
 {
 std::string beautifyInteger(uint64_t number);
-std::string beautifyFileSize(uint64_t number);
 void printStringInHexadecimal(const char* s);
 void printStringInHexadecimal(icu::UnicodeString s);
 void stringReplacement(std::string& str,