diff --git a/src/pixie/paths.nim b/src/pixie/paths.nim
index fa82c31..8c7b7a9 100644
--- a/src/pixie/paths.nim
+++ b/src/pixie/paths.nim
@@ -1623,6 +1623,9 @@ proc fillShapes(
   if pathWidth == 0:
     return
 
+  if pathWidth < 0:
+    raise newException(PixieError, "Path int overflow detected")
+
   var
     coverages = newSeq[uint8](pathWidth)
     hits = newSeq[(float32, int16)](partitioning.maxEntryCount)
@@ -1689,6 +1692,9 @@ proc fillShapes(
   if pathWidth == 0:
     return
 
+  if pathWidth < 0:
+    raise newException(PixieError, "Path int overflow detected")
+
   var
     coverages = newSeq[uint8](pathWidth)
     hits = newSeq[(float32, int16)](partitioning.maxEntryCount)