diff --git a/source/dub/commandline.d b/source/dub/commandline.d
index aab0418..4be40b5 100644
--- a/source/dub/commandline.d
+++ b/source/dub/commandline.d
@@ -21,6 +21,8 @@
 import dub.project;
 import dub.internal.utils : getDUBVersion, getClosestMatch, getTempFile;
 
+import dyaml.stdsumtype;
+
 import std.algorithm;
 import std.array;
 import std.conv;
@@ -32,7 +34,6 @@
 import std.process;
 import std.stdio;
 import std.string;
-import std.sumtype;
 import std.typecons : Tuple, tuple;
 import std.variant;
 import std.path: setExtension;
diff --git a/source/dub/dependency.d b/source/dub/dependency.d
index 8817d5e..e92974d 100644
--- a/source/dub/dependency.d
+++ b/source/dub/dependency.d
@@ -15,11 +15,12 @@
 import dub.semver;
 import dub.internal.logging;
 
+import dyaml.stdsumtype;
+
 import std.algorithm;
 import std.array;
 import std.exception;
 import std.string;
-import std.sumtype;
 
 
 /** Encapsulates the name of a package along with its dependency specification.
diff --git a/source/dub/packagemanager.d b/source/dub/packagemanager.d
index fef7bc4..2f6c534 100644
--- a/source/dub/packagemanager.d
+++ b/source/dub/packagemanager.d
@@ -18,6 +18,8 @@
 import configy.Exceptions;
 public import configy.Read : StrictMode;
 
+import dyaml.stdsumtype;
+
 import std.algorithm : countUntil, filter, map, sort, canFind, remove;
 import std.array;
 import std.conv;
@@ -27,7 +29,6 @@
 import std.file;
 import std.range;
 import std.string;
-import std.sumtype;
 import std.zip;
 
 
diff --git a/source/dub/recipe/packagerecipe.d b/source/dub/recipe/packagerecipe.d
index deedc67..7037f06 100644
--- a/source/dub/recipe/packagerecipe.d
+++ b/source/dub/recipe/packagerecipe.d
@@ -703,7 +703,7 @@
 
 private T clone(T)(ref const(T) val)
 {
-	import std.sumtype;
+	import dyaml.stdsumtype;
 	import std.traits : isSomeString, isDynamicArray, isAssociativeArray, isBasicType, ValueType;
 
 	static if (is(T == immutable)) return val;