diff --git a/src/Magnum/Platform/AbstractXApplication.cpp b/src/Magnum/Platform/AbstractXApplication.cpp
index c9e815624..b9dfc8aa2 100644
--- a/src/Magnum/Platform/AbstractXApplication.cpp
+++ b/src/Magnum/Platform/AbstractXApplication.cpp
@@ -197,6 +197,9 @@ void AbstractXApplication::mousePressEvent(MouseEvent&) {}
 void AbstractXApplication::mouseReleaseEvent(MouseEvent&) {}
 void AbstractXApplication::mouseMoveEvent(MouseMoveEvent&) {}
 
+AbstractXApplication::GLConfiguration::GLConfiguration(): _version(GL::Version::None) {}
+AbstractXApplication::GLConfiguration::~GLConfiguration() = default;
+
 AbstractXApplication::Configuration::Configuration():
     _title("Magnum X Application"), _size(800, 600)
     #ifdef MAGNUM_BUILD_DEPRECATED
diff --git a/src/Magnum/Platform/GlutApplication.cpp b/src/Magnum/Platform/GlutApplication.cpp
index a9d53b6cb..09fc18c35 100644
--- a/src/Magnum/Platform/GlutApplication.cpp
+++ b/src/Magnum/Platform/GlutApplication.cpp
@@ -170,6 +170,9 @@ void GlutApplication::mousePressEvent(MouseEvent&) {}
 void GlutApplication::mouseReleaseEvent(MouseEvent&) {}
 void GlutApplication::mouseMoveEvent(MouseMoveEvent&) {}
 
+GlutApplication::GLConfiguration::GLConfiguration(): _sampleCount(0), _version(GL::Version::None) {}
+GlutApplication::GLConfiguration::~GLConfiguration() = default;
+
 GlutApplication::Configuration::Configuration():
     _title("Magnum GLUT Application"), _size(800, 600)
     #ifdef MAGNUM_BUILD_DEPRECATED