diff --git a/src/repstr/main.cpp b/src/repstr/main.cpp
index 94c640c..bba1b75 100644
--- a/src/repstr/main.cpp
+++ b/src/repstr/main.cpp
@@ -26,7 +26,7 @@ int main(const int argc,const char *argv[]){
             if(be_replaced.size()!=to_replace.size()){
                 throw std::runtime_error("The length of last two characters are not same!\n");
             }
-            for(auto i: zt::Range((size_t)0,argv1.size())){
+            for(auto i: zt::Range(argv1.size())){
                 if(argv1[i]==be_replaced[0]){
                     for(auto j: zt::Range(be_replaced.size())){
                         if(argv1[i+j]!=be_replaced[j]){