diff --git a/desktop_version/src/UtilityClass.cpp b/desktop_version/src/UtilityClass.cpp
index 12d2304d..e0700f7e 100644
--- a/desktop_version/src/UtilityClass.cpp
+++ b/desktop_version/src/UtilityClass.cpp
@@ -267,9 +267,14 @@ void UtilityClass::updateglow()
 
 bool is_number(const char* str)
 {
-	for (int i = 0; str[i] != '\0'; i++)
+	if (!SDL_isdigit(str[0]) && str[0] != '-')
 	{
-		if (!SDL_isdigit(str[i]) && (i != 0 || str[0] != '-'))
+		return false;
+	}
+
+	for (int i = 1; str[i] != '\0'; i++)
+	{
+		if (!SDL_isdigit(str[i]))
 		{
 			return false;
 		}