diff --git a/lib/jkqtplotter.pri b/lib/jkqtplotter.pri
index 525bf47bc2..9f9840122b 100644
--- a/lib/jkqtplotter.pri
+++ b/lib/jkqtplotter.pri
@@ -5,6 +5,9 @@
     QMAKE_CXXFLAGS += /EHsc
     # To enable M_PI, M_E,...
     DEFINES += _USE_MATH_DEFINES
+    # To fix error: C2338: va_start argument must not
+    # have reference type and must not be parenthesized
+    DEFINES += _CRT_NO_VA_START_VALIDATION
 }
 
 HEADERS += $$PWD/jkqtplotter/jkqtpbaseplotter.h \