diff --git a/libgeotiff/CMakeLists.txt b/libgeotiff/CMakeLists.txt
index 46331ad..80fe121 100644
--- a/libgeotiff/CMakeLists.txt
+++ b/libgeotiff/CMakeLists.txt
@@ -122,13 +122,14 @@ INCLUDE_DIRECTORIES(${PROJECT_SOURCE_DIR}/libxtiff)
 # TIFF support - required, default=ON
 SET(WITH_TIFF TRUE CACHE BOOL "Choose if TIFF support should be built")
 
-FIND_PACKAGE(PROJ NO_MODULE QUIET)
-if (NOT PROJ_FOUND)
+FIND_PACKAGE(PROJ4 CONFIG REQUIRED)
+if (NOT PROJ4_FOUND)
     FIND_PACKAGE(PROJ)
 endif ()
 
-IF(PROJ_FOUND)
-    INCLUDE_DIRECTORIES(${PROJ_INCLUDE_DIR})
+IF(PROJ4_FOUND)
+    INCLUDE_DIRECTORIES(${PROJ4_INCLUDE_DIRS})
+    ADD_DEFINITIONS(-DHAVE_LIBPROJ=1 -DACCEPT_USE_OF_DEPRECATED_PROJ_API_H=1)
 ELSE()
     MESSAGE(FATAL_ERROR "Failed to detect PROJ >= 6")
 ENDIF()
@@ -361,7 +362,7 @@ SET_TARGET_PROPERTIES(${GEOTIFF_LIBRARY_TARGET} PROPERTIES
 
 TARGET_LINK_LIBRARIES(${GEOTIFF_LIBRARY_TARGET}
     ${TIFF_LIBRARIES}
-    ${PROJ_LIBRARIES}
+    ${PROJ4_LIBRARIES}
     ${ZLIB_LIBRARIES}
     ${JPEG_LIBRARIES})