diff --git a/build_overrides/build.gni b/build_overrides/build.gni
index 0ef487e..446fa89 100644
--- a/build_overrides/build.gni
+++ b/build_overrides/build.gni
@@ -14,6 +14,9 @@
 # PDFium builds don't support building java targets.
 enable_java_templates = false
 
+# Enables assertions on safety checks in libc++.
+enable_safe_libcxx = true
+
 # Whether to use the neon FPU instruction set or not.
 if (current_cpu == "arm") {
   arm_use_neon = true