diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3273ead..b20fffb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -122,11 +122,11 @@ set(CMAKE_INSTALL_DOCDIR "" CACHE PATH "documentation root (DATAROOTDIR/doc/${PR
 
 set(CMAKE_INSTALL_DOCDIR "${CMAKE_INSTALL_DATAROOTDIR}/doc/${PROJECT_NAME}${LIBAD9361_VERSION_MAJOR}-doc")
 
-find_package(Doxygen)
-if(DOXYGEN_FOUND)
-	option(WITH_DOC "Generate documentation with Doxygen" ON)
+option(WITH_DOC "Generate documentation with Doxygen" ON)
 
-	if (WITH_DOC)
+if (WITH_DOC)
+	find_package(Doxygen REQUIRED)
+	if(DOXYGEN_FOUND)
 		configure_file(${CMAKE_CURRENT_SOURCE_DIR}/Doxyfile.in ${CMAKE_CURRENT_BINARY_DIR}/Doxyfile @ONLY)
 		set(HTML_DEST_DIR ${CMAKE_CURRENT_BINARY_DIR}/html)
 		file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/doc DESTINATION ${HTML_DEST_DIR})
@@ -140,9 +140,9 @@ if(DOXYGEN_FOUND)
 		if(NOT SKIP_INSTALL_ALL)
 			install(DIRECTORY ${HTML_DEST_DIR} DESTINATION ${CMAKE_INSTALL_DOCDIR})
 		endif()
+	else()
+		message(STATUS "Doxygen not found, API documentation won't be generated")
 	endif()
-else()
-	message(STATUS "Doxygen not found, API documentation won't be generated")
 endif()
 
 option(PYTHON_BINDINGS "Install Python bindings" OFF)