diff --git a/.gitignore b/.gitignore
index 0d069753768d..54128923383b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -68,6 +68,10 @@ security/manager/.nss.checkout
 
 # Build directories
 /obj*/
+
+# Hazard analysis results
+/haz-*/
+
 # Gradle build errors
 build/reports/
 
diff --git a/.hgignore b/.hgignore
index 2366708b2fd2..522fa4d51dbf 100644
--- a/.hgignore
+++ b/.hgignore
@@ -64,6 +64,10 @@
 
 # Build directories
 ^obj.*/
+
+# Hazard analysis results
+^haz-.*/
+
 # Gradle build errors
 ^build/reports/