diff --git a/du4/program.c b/du4/program.c
index 2cb81f5..a5e2978 100644
--- a/du4/program.c
+++ b/du4/program.c
@@ -63,7 +63,7 @@ int main()
   	    j++;
   	}
   	for(int k=0;k<i;k++){
-    	char *new_str = compactString(str[i],strlen(str));
+    	char *new_str = compactString(str[k],strlen(str[k]));
     	double first =-5,second =-5,res=-5;
     	char c='E';
     	sscanf(new_str,"%lf%c%lf%*[=]%lf",&first,&c,&second,&res);