--- a/qalculate-qt.pro
+++ b/qalculate-qt.pro
@@ -27,7 +27,7 @@
 TARGET = qalculate-qt
 INCLUDEPATH += src
 win32: {
-	LIBS += -lqalculate -lxml2 -lmpfr -liconv -lintl -lgmp -licuuc -lcurl
+	LIBS += -lqalculate -lxml2 -lmpfr -liconv -lintl -lgmp -licuuc -lcurl -lpthread
 	CONFIG += c++17
 } else {
 	CONFIG += link_pkgconfig
