diff --git a/CMakeLists.txt b/CMakeLists.txt
index d31936200..431eb0a69 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -110,11 +110,11 @@ ign_create_docs(
   TUTORIALS_MAINPAGE_MD "${CMAKE_BINARY_DIR}/tutorials.md"
   ADDITIONAL_INPUT_DIRS "${CMAKE_SOURCE_DIR}/src/plugins"
   TAGFILES
-  "\"${CMAKE_SOURCE_DIR}/doc/qt.tag.xml=http://doc.qt.io/qt-5/\" \
-   \"${IGNITION-MATH_DOXYGEN_TAGFILE} = ${IGNITION-MATH_API_URL}\" \
-   \"${IGNITION-MSGS_DOXYGEN_TAGFILE} = ${IGNITION-MSGS_API_URL}\" \
-   \"${IGNITION-TRANSPORT_DOXYGEN_TAGFILE} = ${IGNITION-TRANSPORT_API_URL}\" \
-   \"${IGNITION-COMMON_DOXYGEN_TAGFILE} = ${IGNITION-COMMON_API_URL}\""
+   "${CMAKE_SOURCE_DIR}/doc/qt.tag.xml=http://doc.qt.io/qt-5/"
+   "${IGNITION-MATH_DOXYGEN_TAGFILE} = ${IGNITION-MATH_API_URL}"
+   "${IGNITION-MSGS_DOXYGEN_TAGFILE} = ${IGNITION-MSGS_API_URL}"
+   "${IGNITION-TRANSPORT_DOXYGEN_TAGFILE} = ${IGNITION-TRANSPORT_API_URL}"
+   "${IGNITION-COMMON_DOXYGEN_TAGFILE} = ${IGNITION-COMMON_API_URL}"
   )
 
 file(COPY ${CMAKE_SOURCE_DIR}/tutorials/images/ DESTINATION ${CMAKE_BINARY_DIR}/doxygen/html/images/)