diff --git a/CMakeLists.txt b/CMakeLists.txt
index c9525870..b5734c45 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -199,7 +199,10 @@ include(MultiFind)
 include(GlibCompileResourcesSupport)
 
 find_package(GLib ${GLib_GLOBAL_VERSION} REQUIRED)
-set(CMAKE_VALA_FLAGS "${CMAKE_VALA_FLAGS} --target-glib=${GLib_VERSION}")
+string(REGEX REPLACE "^([0-9]+)\\.[0-9]+(\\.[0-9]+)?" "\\1" GLib_MAJOR_VERSION "${GLib_VERSION}")
+string(REGEX REPLACE "^[0-9]+\\.([0-9]+)(\\.[0-9]+)?" "\\1" GLib_MINOR_VERSION "${GLib_VERSION}")
+math(EXPR GLib_LAST_RELEASE_MINOR_VERSION "${GLib_MINOR_VERSION} / 2 * 2")
+set(CMAKE_VALA_FLAGS "${CMAKE_VALA_FLAGS} --target-glib=${GLib_MAJOR_VERSION}.${GLib_LAST_RELEASE_MINOR_VERSION}")
 
 add_subdirectory(qlite)
 add_subdirectory(xmpp-vala)
diff --git a/plugins/omemo/src/ui/contact_details_dialog.vala b/plugins/omemo/src/ui/contact_details_dialog.vala
index a40970d0..b4d6d8f0 100644
--- a/plugins/omemo/src/ui/contact_details_dialog.vala
+++ b/plugins/omemo/src/ui/contact_details_dialog.vala
@@ -93,8 +93,7 @@ public class ContactDetailsDialog : Gtk.Dialog {
 
             int sid = plugin.db.identity.row_with(plugin.db.identity.account_id, account.id)[plugin.db.identity.device_id];
             var iri_query = @"omemo-sid-$(sid)=$(fingerprint)";
-#if GLIB_2_66
-            // glib >=2.66 only; never compiled
+#if GLIB_2_66 && VALA_0_50
             string iri = GLib.Uri.join(UriFlags.NONE, "xmpp", null, null, 0, jid.to_string(), iri_query, null);
 #else
             var iri_path_seg = escape_for_iri_path_segment(jid.to_string());