diff --git a/uppsrc/Core/Complex.h b/uppsrc/Core/Complex.h
index 23cbceb8d..a3808e0ad 100644
--- a/uppsrc/Core/Complex.h
+++ b/uppsrc/Core/Complex.h
@@ -20,7 +20,8 @@ struct Complex : std::complex<double>
 
 template<> inline bool IsNull(const Complex& r) { return r.real() < DOUBLE_NULL_LIM || r.imag() < DOUBLE_NULL_LIM; }
 template<> inline unsigned GetHashValue(const Complex& x) { return CombineHash(x.real(), x.imag()); }
-template<> inline String AsString(const Complex& x) { return String().Cat() << "(" << x.real() << "," << x.imag() << ")"; }
+template<> inline String AsString(const std::complex<double>& x) { return String().Cat() << "(" << x.real() << "," << x.imag() << ")"; }
+template<> inline String AsString(const Complex& x) { return AsString((const std::complex<double>&)x); }
 
 template<> inline Stream& operator%(Stream& s, Complex& c)
 {