diff --git a/src/qt/test/test_main.cpp b/src/qt/test/test_main.cpp
--- a/src/qt/test/test_main.cpp
+++ b/src/qt/test/test_main.cpp
@@ -52,10 +52,14 @@
 
     bool fInvalid = false;
 
-    // Prefer the "minimal" platform for the test instead of the normal default
-    // platform ("xcb", "windows", or "cocoa") so tests can't unintentially
-    // interfere with any background GUIs and don't require extra resources.
+// Prefer the "minimal" platform for the test instead of the normal default
+// platform ("xcb", "windows", or "cocoa") so tests can't unintentially
+// interfere with any background GUIs and don't require extra resources.
+#if defined(WIN32)
+    _putenv_s("QT_QPA_PLATFORM", "minimal");
+#else
     setenv("QT_QPA_PLATFORM", "minimal", 0);
+#endif
 
     // Don't remove this, it's needed to access
     // QApplication:: and QCoreApplication:: in the tests