diff --git a/src/dmd/builtin.d b/src/dmd/builtin.d
index 9b99735b196f..1045522b753e 100644
--- a/src/dmd/builtin.d
+++ b/src/dmd/builtin.d
@@ -311,7 +311,7 @@ extern (C++) Expression eval_yl2xp1(Loc loc, FuncDeclaration fd, Expressions* ar
 
 public extern (C++) void builtin_init()
 {
-    builtins._init(84);
+    builtins._init(65);
     // @safe @nogc pure nothrow real function(real)
     add_builtin("_D4core4math3sinFNaNbNiNfeZe", &eval_sin);
     add_builtin("_D4core4math3cosFNaNbNiNfeZe", &eval_cos);
@@ -352,51 +352,17 @@ public extern (C++) void builtin_init()
     // @safe @nogc pure nothrow long function(real)
     add_builtin("_D4core4math6rndtolFNaNbNiNfeZl", &eval_unimp);
     // @safe @nogc pure nothrow real function(real)
-    add_builtin("_D3std4math3sinFNaNbNiNfeZe", &eval_sin);
-    add_builtin("_D3std4math3cosFNaNbNiNfeZe", &eval_cos);
     add_builtin("_D3std4math3tanFNaNbNiNfeZe", &eval_tan);
-    add_builtin("_D3std4math4sqrtFNaNbNiNfeZe", &eval_sqrt);
-    add_builtin("_D3std4math4fabsFNaNbNiNfeZe", &eval_fabs);
     add_builtin("_D3std4math5expm1FNaNbNiNfeZe", &eval_unimp);
     // @trusted @nogc pure nothrow real function(real)
-    add_builtin("_D3std4math3sinFNaNbNiNeeZe", &eval_sin);
-    add_builtin("_D3std4math3cosFNaNbNiNeeZe", &eval_cos);
     add_builtin("_D3std4math3tanFNaNbNiNeeZe", &eval_tan);
-    add_builtin("_D3std4math4sqrtFNaNbNiNeeZe", &eval_sqrt);
-    add_builtin("_D3std4math4fabsFNaNbNiNeeZe", &eval_fabs);
     add_builtin("_D3std4math3expFNaNbNiNeeZe", &eval_exp);
     add_builtin("_D3std4math5expm1FNaNbNiNeeZe", &eval_expm1);
     add_builtin("_D3std4math4exp2FNaNbNiNeeZe", &eval_exp2);
-    // @safe @nogc pure nothrow double function(double)
-    add_builtin("_D3std4math4sqrtFNaNbNiNfdZd", &eval_sqrt);
-    // @safe @nogc pure nothrow float function(float)
-    add_builtin("_D3std4math4sqrtFNaNbNiNffZf", &eval_sqrt);
     // @safe @nogc pure nothrow real function(real, real)
     add_builtin("_D3std4math5atan2FNaNbNiNfeeZe", &eval_unimp);
-    if (CTFloat.yl2x_supported)
-    {
-        add_builtin("_D3std4math4yl2xFNaNbNiNfeeZe", &eval_yl2x);
-    }
-    else
-    {
-        add_builtin("_D3std4math4yl2xFNaNbNiNfeeZe", &eval_unimp);
-    }
-    if (CTFloat.yl2xp1_supported)
-    {
-        add_builtin("_D3std4math6yl2xp1FNaNbNiNfeeZe", &eval_yl2xp1);
-    }
-    else
-    {
-        add_builtin("_D3std4math6yl2xp1FNaNbNiNfeeZe", &eval_unimp);
-    }
-    // @safe @nogc pure nothrow long function(real)
-    add_builtin("_D3std4math6rndtolFNaNbNiNfeZl", &eval_unimp);
-
     // @safe @nogc pure nothrow T function(T, int)
     add_builtin("_D4core4math5ldexpFNaNbNiNfeiZe", &eval_ldexp);
-    add_builtin("_D3std4math5ldexpFNaNbNiNfeiZe", &eval_ldexp);
-    add_builtin("_D3std4math5ldexpFNaNbNiNfdiZd", &eval_ldexp);
-    add_builtin("_D3std4math5ldexpFNaNbNiNffiZf", &eval_ldexp);
 
     add_builtin("_D3std4math3logFNaNbNiNfeZe", &eval_log);