diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 913a85d7..877c6fce 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -51,7 +51,7 @@ include_directories ("${PROJECT_SOURCE_DIR}/lib_hash/")
 include_directories ("${PROJECT_SOURCE_DIR}/extractors/")
 include_directories ("${PROJECT_SOURCE_DIR}/wrappers/")
 include_directories ("${PROJECT_SOURCE_DIR}/libpng/")
-include_directories ("${PROJEXT_SOURCE_DIR}/zlib/")
+include_directories ("${PROJECT_SOURCE_DIR}/zlib/")
 aux_source_directory ("${PROJECT_SOURCE_DIR}/protobuf-c/" SOURCEFILE)
 aux_source_directory ("${PROJECT_SOURCE_DIR}/zvbi/" SOURCEFILE)
 aux_source_directory ("${PROJECT_SOURCE_DIR}/lib_hash/" SOURCEFILE)