diff --git a/pw_build/BUILD.gn b/pw_build/BUILD.gn
index 339a031..d228f35 100644
--- a/pw_build/BUILD.gn
+++ b/pw_build/BUILD.gn
@@ -73,6 +73,7 @@
     "-Wimplicit-fallthrough",
     "-Wcast-qual",
     "-Wundef",
+    "-Wpointer-arith",
 
     # Make all warnings errors, except for the exemptions below.
     "-Werror",