diff --git a/core/src/main/kotlin/se/lth/cs/TraceLoader.kt b/core/src/main/kotlin/se/lth/cs/TraceLoader.kt
index 005e50263c9330d3b556919660b179b0b226c019..81c850e6d6be9e39ee0181cea11bcd23a9ddd6fc 100644
--- a/core/src/main/kotlin/se/lth/cs/TraceLoader.kt
+++ b/core/src/main/kotlin/se/lth/cs/TraceLoader.kt
@@ -38,7 +38,9 @@ class TraceLoader {
                 var interfaceCandidates = candidates.first
                 initClass = candidates.second
 
-                val traceKey = kvp.key.left
+                val traceKey = String.format("%s:%d",
+                        kvp.key.left,
+                        Integer.parseInt(kvp.key.right))
                 val app = generateSyntheticBenchmark(
                         traceKey,
                         interfaceCandidates,