diff --git a/build-constraints.yaml b/build-constraints.yaml
index 875ab184..54910ae4 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -6891,6 +6891,8 @@ packages:
 # Package flags are applied to individual packages, and override the values of
 # global-flags
 package-flags:
+    hgeometry:
+        planargraph: false # Won't be required by version 0.13
     QuickCheck:
         old-random: true
     pathtype: