diff --git a/src/calamares/CMakeLists.txt b/src/calamares/CMakeLists.txt
index d8da1be35..11292283e 100644
--- a/src/calamares/CMakeLists.txt
+++ b/src/calamares/CMakeLists.txt
@@ -1,5 +1,7 @@
 project( calamares )
 
+add_definitions( -DUIDLLEXPORT_PRO )
+
 if( NOT CMAKE_BUILD_TYPE STREQUAL "Release" )
     message( "Building in debug mode, enabling all debug updates" )
 endif()
diff --git a/src/libcalamares/CMakeLists.txt b/src/libcalamares/CMakeLists.txt
index d99654229..6af3edadf 100644
--- a/src/libcalamares/CMakeLists.txt
+++ b/src/libcalamares/CMakeLists.txt
@@ -3,6 +3,7 @@ project( calamareslib )
 add_definitions( ${QT_DEFINITIONS} )
 add_definitions( -DQT_SHARED )
 add_definitions( -DQT_SHAREDPOINTER_TRACK_POINTERS )
+add_definitions( -DDLLEXPORT_PRO )
 
 configure_file( ${CMAKE_CURRENT_SOURCE_DIR}/../calamares/Config.h.in
                 ${CMAKE_CURRENT_BINARY_DIR}/config.h )