diff --git a/src/dynamic-map-css.js b/src/dynamic-map-css.js
index f7eae34..f57e747 100644
--- a/src/dynamic-map-css.js
+++ b/src/dynamic-map-css.js
@@ -14,6 +14,13 @@ const getMaxAndMinCountryDataValues = (countryData) => {
     if (value > max || max === undefined) max = value;
   });
 
+  // check if min and max is equal
+  // this happens if the country data is only 1
+  if (max === min) {
+    // set min to zero
+    min = 0;
+  }
+
   return { min, max };
 };