diff --git a/Makefile b/Makefile
index 63e15e657fa..fcb1bf50d96 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 GPU=0
 CUDNN=0
-OPENCV=0
+OPENCV=1
 OPENMP=0
 DEBUG=0
 
@@ -42,8 +42,8 @@ CFLAGS+=$(OPTS)
 ifeq ($(OPENCV), 1) 
 COMMON+= -DOPENCV
 CFLAGS+= -DOPENCV
-LDFLAGS+= `pkg-config --libs opencv` -lstdc++
-COMMON+= `pkg-config --cflags opencv` 
+LDFLAGS+= `pkg-config --libs opencv4` -lstdc++
+COMMON+= `pkg-config --cflags opencv4` 
 endif
 
 ifeq ($(GPU), 1) 
diff --git a/src/image_opencv.cpp b/src/image_opencv.cpp
index 7511280be07..9b75f509307 100644
--- a/src/image_opencv.cpp
+++ b/src/image_opencv.cpp
@@ -1,3 +1,7 @@
+#include "opencv2/core/core_c.h"
+#include "opencv2/videoio/legacy/constants_c.h"
+#include "opencv2/highgui/highgui_c.h"
+
 #ifdef OPENCV
 
 #include "stdio.h"
@@ -60,7 +64,7 @@ Mat image_to_mat(image im)
 
 image mat_to_image(Mat m)
 {
-    IplImage ipl = m;
+    IplImage ipl = cvIplImage(m);
     image im = ipl_to_image(&ipl);
     rgbgr_image(im);
     return im;