diff --git a/CMakeLists.txt b/CMakeLists.txt
index d681a85c..6fc8bc64 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -79,7 +79,7 @@ IF (BROTLI_DEC_FOUND AND BROTLI_ENC_FOUND)
     LIST(APPEND CORE_FILES
         lib/certificate_compression.c)
     LIST(APPEND CORE_EXTRA_LIBS ${BROTLI_DEC_LIBRARIES} ${BROTLI_ENC_LIBRARIES})
-    LIST(APPEND CORE_EXTRA_LIBS_DIRS (${BROTLI_DEC_LIBRARY_DIRS} ${BROTLI_ENC_LIBRARY_DIRS}))
+    LIST(APPEND CORE_EXTRA_LIBS_DIRS ${BROTLI_DEC_LIBRARY_DIRS} ${BROTLI_ENC_LIBRARY_DIRS})
 ENDIF ()
 
 ADD_LIBRARY(picotls-core ${CORE_FILES})