diff --git a/src/moc/CMakeLists.txt b/src/moc/CMakeLists.txt
index 97142a8..7fcf131 100644
--- a/src/moc/CMakeLists.txt
+++ b/src/moc/CMakeLists.txt
@@ -1,48 +1,49 @@
 #=============================================================================
 # Copyright 2018       Helio Chissini de Castro <helio@kde.org>
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
 # are met:
 #
 # 1. Redistributions of source code must retain the copyright
 #    notice, this list of conditions and the following disclaimer.
 # 2. Redistributions in binary form must reproduce the copyright
 #    notice, this list of conditions and the following disclaimer in the
 #    documentation and/or other materials provided with the distribution.
 # 3. The name of the author may not be used to endorse or promote products
 #    derived from this software without specific prior written permission.
 #
 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 set(MOC_SRCS
     ${PROJECT_SOURCE_DIR}/src/tools/qbuffer.cpp
     ${PROJECT_SOURCE_DIR}/src/tools/qcollection.cpp
     ${PROJECT_SOURCE_DIR}/src/tools/qdatetime.cpp
     ${PROJECT_SOURCE_DIR}/src/tools/qdatastream.cpp
     ${PROJECT_SOURCE_DIR}/src/tools/qgarray.cpp
     ${PROJECT_SOURCE_DIR}/src/tools/qgdict.cpp
     ${PROJECT_SOURCE_DIR}/src/tools/qglist.cpp
     ${PROJECT_SOURCE_DIR}/src/tools/qglobal.cpp
     ${PROJECT_SOURCE_DIR}/src/tools/qgvector.cpp
     ${PROJECT_SOURCE_DIR}/src/tools/qiodevice.cpp
     ${PROJECT_SOURCE_DIR}/src/tools/qstring.cpp
     )
 
 byacc_target(MyParser moc.y ${CMAKE_CURRENT_BINARY_DIR}/parser.cpp)
 flex_target(MyScanner moc.l ${CMAKE_CURRENT_BINARY_DIR}/lexer.cpp)
 add_flex_byacc_dependency(MyScanner MyParser)
 
 add_executable(moc-qt1 ${MOC_SRCS} ${BYACC_MyParser_OUTPUTS})
+target_compile_definitions(moc-qt1 PRIVATE -DYYDEBUG=1)
 target_compile_options(moc-qt1 PRIVATE -fno-strength-reduce)
 target_include_directories(moc-qt1 PRIVATE ${PROJECT_SOURCE_DIR}/include)
 install(TARGETS moc-qt1 RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})