diff --git a/Compiler/Util/Flags.mo b/Compiler/Util/Flags.mo
index 772ef8ae9d..ba3a7b44a5 100644
--- a/Compiler/Util/Flags.mo
+++ b/Compiler/Util/Flags.mo
@@ -774,7 +774,6 @@ constant ConfigFlag PRE_OPT_MODULES = CONFIG_FLAG(12, "preOptModules",
     "evaluateParameters",
     "simplifyIfEquations",
     "expandDerOperator",
-    "removeEqualFunctionCalls",
     "clockPartitioning",
     "findStateOrder",
     "replaceEdgeChange",