diff --git a/build_files/cmake/platform/platform_apple.cmake b/build_files/cmake/platform/platform_apple.cmake
index 48be5424187..f8203e94efa 100644
--- a/build_files/cmake/platform/platform_apple.cmake
+++ b/build_files/cmake/platform/platform_apple.cmake
@@ -154,9 +154,8 @@ if(WITH_FRIBIDI)
   find_package(Fribidi)
 endif()
 
-if(WITH_IMAGE_OPENEXR)
-  find_package(OpenEXR)
-endif()
+# Header dependency of required OpenImageIO.
+find_package(OpenEXR REQUIRED)
 add_bundled_libraries(openexr/lib)
 add_bundled_libraries(imath/lib)
 
diff --git a/intern/cycles/CMakeLists.txt b/intern/cycles/CMakeLists.txt
index 2047a6fc98a..080d2ef79dc 100644
--- a/intern/cycles/CMakeLists.txt
+++ b/intern/cycles/CMakeLists.txt
@@ -206,6 +206,7 @@ include_directories(
   SYSTEM
   ${BOOST_INCLUDE_DIR}
   ${OPENIMAGEIO_INCLUDE_DIRS}
+  ${IMATH_INCLUDE_DIRS}
   ${OPENEXR_INCLUDE_DIRS}
   ${PUGIXML_INCLUDE_DIR}
 )
diff --git a/source/blender/imbuf/intern/oiio/CMakeLists.txt b/source/blender/imbuf/intern/oiio/CMakeLists.txt
index 3ed76ccd1ea..10a4b36c788 100644
--- a/source/blender/imbuf/intern/oiio/CMakeLists.txt
+++ b/source/blender/imbuf/intern/oiio/CMakeLists.txt
@@ -11,6 +11,7 @@ set(INC
 )
 
 set(INC_SYS
+  ${IMATH_INCLUDE_DIRS}
   ${OPENIMAGEIO_INCLUDE_DIRS}
 )