diff --git a/CPU_version/svo/CMakeLists.txt b/CPU_version/svo/CMakeLists.txt
index 5ecd775..c3ace90 100644
--- a/CPU_version/svo/CMakeLists.txt
+++ b/CPU_version/svo/CMakeLists.txt
@@ -47,7 +47,7 @@ ENDIF()
 SET(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS} -O3 -fsee -fomit-frame-pointer -fno-signed-zeros -fno-math-errno -funroll-loops")
 
 # Add plain cmake packages 
-FIND_PACKAGE(OpenCV REQUIRED)
+FIND_PACKAGE(OpenCV 3 REQUIRED)
 FIND_PACKAGE(Eigen REQUIRED)
 FIND_PACKAGE(Sophus REQUIRED)
 FIND_PACKAGE(fast REQUIRED)
diff --git a/CPU_version/vio_svo/CMakeLists.txt b/CPU_version/vio_svo/CMakeLists.txt
index 70101db..7fdf637 100644
--- a/CPU_version/vio_svo/CMakeLists.txt
+++ b/CPU_version/vio_svo/CMakeLists.txt
@@ -37,7 +37,7 @@ FIND_PACKAGE(catkin REQUIRED COMPONENTS
 )
 
 # Add plain cmake packages 
-FIND_PACKAGE(OpenCV REQUIRED)
+FIND_PACKAGE(OpenCV 3 REQUIRED)
 FIND_PACKAGE(Eigen REQUIRED)
 FIND_PACKAGE(Sophus REQUIRED)
 FIND_PACKAGE(Boost REQUIRED COMPONENTS thread)