--- a/python/mozbuild/mozbuild/backend/cpp_eclipse.py
+++ b/python/mozbuild/mozbuild/backend/cpp_eclipse.py
@@ -584,16 +584,17 @@ content-types/org.eclipse.core.runtime.x
 content-types/org.eclipse.wst.jsdt.core.jsSource/file-extensions=jsm
 """
 
 STATIC_UI_PREFS="""eclipse.preferences.version=1
 showIntro=false
 """
 
 STATIC_CDT_CORE_PREFS="""eclipse.preferences.version=1
+indexer.updatePolicy=0
 """
 
 FORMATTER_SETTINGS = """org.eclipse.cdt.core.formatter.alignment_for_arguments_in_method_invocation=16
 org.eclipse.cdt.core.formatter.alignment_for_assignment=16
 org.eclipse.cdt.core.formatter.alignment_for_base_clause_in_type_declaration=80
 org.eclipse.cdt.core.formatter.alignment_for_binary_expression=16
 org.eclipse.cdt.core.formatter.alignment_for_compact_if=16
 org.eclipse.cdt.core.formatter.alignment_for_conditional_expression=34