diff --git a/build/moz.configure/warnings.configure b/build/moz.configure/warnings.configure
index 88acd905f216..ac35a0e572c2 100755
--- a/build/moz.configure/warnings.configure
+++ b/build/moz.configure/warnings.configure
@@ -99,6 +99,7 @@ check_and_add_warning("-Wc++2a-compat", cxx_compiler)
 check_and_add_warning("-Wcomma-subscript", cxx_compiler)
 check_and_add_warning("-Wenum-compare-conditional")
 check_and_add_warning("-Wenum-float-conversion")
+check_and_add_warning("-Wvolatile", cxx_compiler)
 
 # Downgrade some C++20 warnings-as-errors to warnings that we can fix after we
 # compile as C++20 (bug 1768116). They don't need to block upgrading to C++20.
@@ -108,8 +109,6 @@ check_and_add_warning("-Wno-error=deprecated-anon-enum-enum-conversion", cxx_com
 check_and_add_warning("-Wno-error=deprecated-enum-enum-conversion", cxx_compiler)
 check_and_add_warning("-Wno-error=deprecated-pragma", cxx_compiler)
 check_and_add_warning("-Wno-error=deprecated-this-capture", cxx_compiler)
-check_and_add_warning("-Wno-error=deprecated-volatile", cxx_compiler)
-check_and_add_warning("-Wno-error=volatile", cxx_compiler)
 
 # catches possible misuse of the comma operator
 check_and_add_warning("-Wcomma", cxx_compiler)