diff --git a/api/Makefile.am b/api/Makefile.am
index 225e37ddd..76a8ed40a 100644
--- a/api/Makefile.am
+++ b/api/Makefile.am
@@ -88,7 +88,7 @@ tesseract_LDADD = libtesseract.la
 
 tesseract_LDFLAGS = $(OPENCL_LDFLAGS)
 
-tesseract_LDADD += $(OPENMP_CFLAGS)
+tesseract_LDADD += $(OPENMP_CXXFLAGS)
 
 if T_WIN
 tesseract_LDADD += -lws2_32