diff --git a/src/VlcSource.h b/src/VlcSource.h
index 3781727c86..57c1697367 100644
--- a/src/VlcSource.h
+++ b/src/VlcSource.h
@@ -36,17 +36,35 @@ class VlcPoint;
 class VlcSourceCount final {
     // TYPES
     struct PointCmp {
+        static int getIndexLength(const std::string& s) {
+            int indexLength = 0;
+            while (std::isdigit(s[s.size() - 1 - indexLength])) { indexLength++; }
+            return indexLength;
+        }
         bool operator()(const VlcPoint* a, const VlcPoint* b) const {
             if (a->comment().rfind("toggle", 0) != 0) {
                 // not toggle coverage, compare pointers
                 return a < b;
-            } else {
-                const std::string aStripped = a->commentStripped();
-                const std::string bStripped = b->commentStripped();
-                const int aIndex = std::stoi(aStripped.substr(aStripped.rfind("_") + 1));
-                const int bIndex = std::stoi(bStripped.substr(bStripped.rfind("_") + 1));
-                return aIndex < bIndex;
             }
+            const std::string aStripped = a->commentStripped();
+            const std::string bStripped = b->commentStripped();
+            int aIndexLength = getIndexLength(aStripped);
+            int bIndexLength = getIndexLength(bStripped);
+            const std::string aWithoutIndex = aStripped.substr(0, aStripped.size() - aIndexLength);
+            const std::string bWithoutIndex = bStripped.substr(0, bStripped.size() - bIndexLength);
+            if (aWithoutIndex != bWithoutIndex) {
+                // different variables, compare names
+                return aWithoutIndex < bWithoutIndex;
+            }
+            if (aIndexLength == 0 || bIndexLength == 0) {
+                // probably a case like:
+                // reg clk, clk2;
+                // compare pointers, as done in old way
+                return a < b;
+            }
+            const int aIndex = std::stoi(aStripped.substr(aStripped.size() - aIndexLength));
+            const int bIndex = std::stoi(bStripped.substr(bStripped.size() - bIndexLength));
+            return aIndex < bIndex;
         }
     };
     using PointsSet = std::set<VlcPoint*, PointCmp>;