diff --git a/brownie/_gui/report.py b/brownie/_gui/report.py
index 563351803..c0a55a7a7 100755
--- a/brownie/_gui/report.py
+++ b/brownie/_gui/report.py
@@ -1,6 +1,6 @@
 #!/usr/bin/python3
 
-from pathlib import Path
+import warnings
 
 from .bases import SelectBox
 
@@ -58,8 +58,11 @@ def _select(self, event):
             return
         report = self.root.active_report[value][contract]
         for path, (start, stop, color, msg) in [(k, x) for k, v in report.items() for x in v]:
-            label = Path(path).name
-            self.note.mark(label, color, start, stop, msg)
+            label = self.root.pathMap[path]
+            try:
+                self.note.mark(label, color, start, stop, msg)
+            except StopIteration:
+                warnings.warn(f"Report contains data for an unknown contract: {label}")
 
     def toggle_off(self):
         self.root.highlight_key = None
diff --git a/brownie/_gui/root.py b/brownie/_gui/root.py
index fb654af2a..9cc7fd952 100755
--- a/brownie/_gui/root.py
+++ b/brownie/_gui/root.py
@@ -72,8 +72,9 @@ def set_active_contract(self, contract_name):
         self.main.note.set_active(build_json["sourcePath"])
         self.main.oplist.set_opcodes(build_json["pcMap"])
         self.pcMap = dict((str(k), v) for k, v in build_json["pcMap"].items())
+        self.pathMap = build_json["allSourcePaths"]
         for value in (v for v in self.pcMap.values() if "path" in v):
-            value["path"] = build_json["allSourcePaths"][value["path"]]
+            value["path"] = self.pathMap[value["path"]]
 
     def destroy(self):
         super().destroy()