diff --git a/configure.in b/configure.in
index ac2697a1bb2..0d1680b1925 100644
--- a/configure.in
+++ b/configure.in
@@ -6996,10 +6996,13 @@ if test -z "$MOZ_ENABLE_WARNINGS_AS_ERRORS"; then
 elif test "$GNU_CC"; then
     # Prevent the following GCC warnings from being treated as errors:
     # -Wuninitialized - too many false positives
+    # -Wmaybe-uninitialized - too many false positives
     # -Wdeprecated-declarations - we don't want our builds held hostage when a
     #   platform-specific API becomes deprecated.
     MOZ_C_SUPPORTS_WARNING(-W, no-error=uninitialized, ac_c_has_noerror_uninitialized)
     MOZ_CXX_SUPPORTS_WARNING(-W, no-error=uninitialized, ac_cxx_has_noerror_uninitialized)
+    MOZ_C_SUPPORTS_WARNING(-W, no-error=maybe-uninitialized, ac_c_has_noerror_maybe_uninitialized)
+    MOZ_CXX_SUPPORTS_WARNING(-W, no-error=maybe-uninitialized, ac_cxx_has_noerror_maybe_uninitialized)
     MOZ_C_SUPPORTS_WARNING(-W, no-error=deprecated-declarations, ac_c_has_noerror_deprecated_declarations)
     MOZ_CXX_SUPPORTS_WARNING(-W, no-error=deprecated-declarations, ac_cxx_has_noerror_deprecated_declarations)
 fi
diff --git a/js/src/configure.in b/js/src/configure.in
index 639ac3ad433..18725935f0d 100644
--- a/js/src/configure.in
+++ b/js/src/configure.in
@@ -3263,10 +3263,13 @@ if test -z "$MOZ_ENABLE_WARNINGS_AS_ERRORS"; then
 elif test "$GNU_CC"; then
     # Prevent the following GCC warnings from being treated as errors:
     # -Wuninitialized - too many false positives
+    # -Wmaybe-uninitialized - too many false positives
     # -Wdeprecated-declarations - we don't want our builds held hostage when a
     #   platform-specific API becomes deprecated.
     MOZ_C_SUPPORTS_WARNING(-W, no-error=uninitialized, ac_c_has_noerror_uninitialized)
     MOZ_CXX_SUPPORTS_WARNING(-W, no-error=uninitialized, ac_cxx_has_noerror_uninitialized)
+    MOZ_C_SUPPORTS_WARNING(-W, no-error=maybe-uninitialized, ac_c_has_noerror_maybe_uninitialized)
+    MOZ_CXX_SUPPORTS_WARNING(-W, no-error=maybe-uninitialized, ac_cxx_has_noerror_maybe_uninitialized)
     MOZ_C_SUPPORTS_WARNING(-W, no-error=deprecated-declarations, ac_c_has_noerror_deprecated_declarations)
     MOZ_CXX_SUPPORTS_WARNING(-W, no-error=deprecated-declarations, ac_cxx_has_noerror_deprecated_declarations)
 fi