diff --git a/dmd/complex_t.h b/dmd/complex_t.h
index a1b4f4ed..fa39271e 100644
--- a/dmd/complex_t.h
+++ b/dmd/complex_t.h
@@ -16,12 +16,14 @@
 
 struct complex_t
 {
-    long double re;
-    long double im;
+    longdouble re;
+    longdouble im;
 
     complex_t() { this->re = 0; this->im = 0; }
-    complex_t(long double re) { this->re = re; this->im = 0; }
-    complex_t(long double re, long double im) { this->re = re; this->im = im; }
+    complex_t(longdouble re) { this->re = re; this->im = 0; }
+    complex_t(double re) { this->re = re; this->im = 0; }
+    complex_t(longdouble re, longdouble im) { this->re = re; this->im = im; }
+    complex_t(double re, double im) { this->re = re; this->im = im; }
 
     complex_t operator + (complex_t y) { complex_t r; r.re = re + y.re; r.im = im + y.im; return r; }
     complex_t operator - (complex_t y) { complex_t r; r.re = re - y.re; r.im = im - y.im; return r; }
@@ -30,9 +32,9 @@ struct complex_t
 
     complex_t operator / (complex_t y)
     {
-        long double abs_y_re = y.re < 0 ? -y.re : y.re;
-        long double abs_y_im = y.im < 0 ? -y.im : y.im;
-        long double r, den;
+        longdouble abs_y_re = y.re < 0 ? -y.re : y.re;
+        longdouble abs_y_im = y.im < 0 ? -y.im : y.im;
+        longdouble r, den;
 
         if (abs_y_re < abs_y_im)
         {
@@ -56,17 +58,17 @@ struct complex_t
     int operator != (complex_t y) { return re != y.re || im != y.im; }
 };
 
-inline complex_t operator * (long double x, complex_t y) { return complex_t(x) * y; }
-inline complex_t operator * (complex_t x, long double y) { return x * complex_t(y); }
-inline complex_t operator / (complex_t x, long double y) { return x / complex_t(y); }
+inline complex_t operator * (longdouble x, complex_t y) { return complex_t(x) * y; }
+inline complex_t operator * (complex_t x, longdouble y) { return x * complex_t(y); }
+inline complex_t operator / (complex_t x, longdouble y) { return x / complex_t(y); }
 
 
-inline long double creall(complex_t x)
+inline longdouble creall(complex_t x)
 {
     return x.re;
 }
 
-inline long double cimagl(complex_t x)
+inline longdouble cimagl(complex_t x)
 {
     return x.im;
 }
diff --git a/dmd/expression.c b/dmd/expression.c
index ab6e036e..bf618058 100644
--- a/dmd/expression.c
+++ b/dmd/expression.c
@@ -1074,13 +1074,13 @@ uinteger_t Expression::toUInteger()
 real_t Expression::toReal()
 {
     error("Floating point constant expression expected instead of %s", toChars());
-    return 0;
+    return ldouble(0);
 }
 
 real_t Expression::toImaginary()
 {
     error("Floating point constant expression expected instead of %s", toChars());
-    return 0;
+    return ldouble(0);
 }
 
 complex_t Expression::toComplex()
@@ -1089,7 +1089,7 @@ complex_t Expression::toComplex()
 #ifdef IN_GCC
     return complex_t(real_t(0)); // %% nicer
 #else
-    return 0;
+    return 0.0;
 #endif
 }
 
@@ -1473,14 +1473,14 @@ real_t IntegerExp::toReal()
     toInteger();
     t = type->toBasetype();
     if (t->ty == Tuns64)
-        return (real_t)(d_uns64)value;
+        return ldouble((d_uns64)value);
     else
-        return (real_t)(d_int64)value;
+        return ldouble((d_int64)value);
 }
 
 real_t IntegerExp::toImaginary()
 {
-    return (real_t) 0;
+    return ldouble(0);
 }
 
 complex_t IntegerExp::toComplex()
@@ -1722,12 +1722,12 @@ uinteger_t RealExp::toUInteger()
 
 real_t RealExp::toReal()
 {
-    return type->isreal() ? value : 0;
+    return type->isreal() ? value : ldouble(0);
 }
 
 real_t RealExp::toImaginary()
 {
-    return type->isreal() ? 0 : value;
+    return type->isreal() ? ldouble(0) : value;
 }
 
 complex_t RealExp::toComplex()
@@ -9251,7 +9251,7 @@ Expression *DivAssignExp::semantic(Scope *sc)
         if (t1->isreal())
         {   // x/iv = i(-x/v)
             // Therefore, the result is 0
-            e2 = new CommaExp(loc, e2, new RealExp(loc, 0, t1));
+            e2 = new CommaExp(loc, e2, new RealExp(loc, ldouble(0), t1));
             e2->type = t1;
             e = new AssignExp(loc, e1, e2);
             e->type = t1;
diff --git a/dmd/mars.h b/dmd/mars.h
index 4110ccd2..1873efd9 100644
--- a/dmd/mars.h
+++ b/dmd/mars.h
@@ -371,8 +371,10 @@ extern Global global;
  */
 #define WINDOWS_SEH     (_WIN32 && __DMC__)
 
+#include "longdouble.h"
 
 #ifdef __DMC__
+ #include  <complex.h>
  typedef _Complex long double complex_t;
 #else
  #ifndef IN_GCC
@@ -403,7 +405,7 @@ typedef uint64_t                d_uns64;
 
 typedef float                   d_float32;
 typedef double                  d_float64;
-typedef long double             d_float80;
+typedef longdouble              d_float80;
 
 typedef d_uns8                  d_char;
 typedef d_uns16                 d_wchar;
@@ -412,7 +414,7 @@ typedef d_uns32                 d_dchar;
 #ifdef IN_GCC
 #include "d-gcc-real.h"
 #else
-typedef long double real_t;
+typedef longdouble real_t;
 #endif
 
 // Modify OutBuffer::writewchar to write the correct size of wchar
diff --git a/dmd/mtype.c b/dmd/mtype.c
index 729a3fd5..5130dec6 100644
--- a/dmd/mtype.c
+++ b/dmd/mtype.c
@@ -1451,7 +1451,7 @@ Expression *TypeBasic::dotExp(Scope *sc, Expression *e, Identifier *ident)
             case Timaginary64:  t = tfloat64;           goto L2;
             case Timaginary80:  t = tfloat80;           goto L2;
             L2:
-                e = new RealExp(e->loc, 0.0, t);
+                e = new RealExp(e->loc, ldouble(0.0), t);
                 break;
 
             default:
@@ -1481,7 +1481,7 @@ Expression *TypeBasic::dotExp(Scope *sc, Expression *e, Identifier *ident)
             case Tfloat32:
             case Tfloat64:
             case Tfloat80:
-                e = new RealExp(e->loc, 0.0, this);
+                e = new RealExp(e->loc, ldouble(0.0), this);
                 break;
 
             default: