diff --git a/src/main.cpp b/src/main.cpp
index e211755..794dace 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -182,6 +182,7 @@ void error(string in, int exitc = 1) {
 bool isInt(string in) {
     try {
         stoi(in);
+        if (stod(in) != stoi(in)) return false;
         return true;
     } catch (...) {
         return false;