diff --git a/include/anthem/Utils.h b/include/anthem/Utils.h
index 6f365d8..b7f64ca 100644
--- a/include/anthem/Utils.h
+++ b/include/anthem/Utils.h
@@ -75,6 +75,7 @@ inline bool isReservedVariableName(const char *variableName)
 
 	assert(std::strlen(AuxiliaryBodyVariablePrefix) == std::strlen(AuxiliaryHeadVariablePrefix));
 	assert(std::strlen(AuxiliaryBodyVariablePrefix) == std::strlen(AnonymousVariablePrefix));
+	assert(std::strlen(AuxiliaryBodyVariablePrefix) == std::strlen(UserVariablePrefix));
 
 	const auto prefixLength = std::strlen(AuxiliaryBodyVariablePrefix);