diff --git a/CMakeLists.txt b/CMakeLists.txt
index 026b034ef..503237cd4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -383,7 +383,6 @@ IF(WANT_JACK)
 			SET(LMMS_HAVE_WEAKJACK TRUE)
 			SET(WEAKJACK_INCLUDE_DIRS ${CMAKE_SOURCE_DIR}/src/3rdparty/weakjack/weakjack)
 			SET(STATUS_JACK "OK (weak linking enabled)")
-			SET(JACK_INCLUDE_DIRS "")
 			# use dlsym instead
 			SET(JACK_LIBRARIES ${CMAKE_DL_LIBS})
 		ELSE()
@@ -391,6 +390,7 @@ IF(WANT_JACK)
 		ENDIF()
 		SET(LMMS_HAVE_JACK TRUE)
 	ELSE(JACK_FOUND)
+		SET(JACK_INCLUDE_DIRS "")
 		SET(STATUS_JACK "not found, please install libjack0.100.0-dev (or similar) "
 			"if you require JACK support")
 	ENDIF(JACK_FOUND)
diff --git a/src/3rdparty/weakjack/CMakeLists.txt b/src/3rdparty/weakjack/CMakeLists.txt
index b9f24e331..7600c3915 100644
--- a/src/3rdparty/weakjack/CMakeLists.txt
+++ b/src/3rdparty/weakjack/CMakeLists.txt
@@ -7,6 +7,6 @@ IF(LMMS_HAVE_WEAKJACK)
 	
 	# Library stub for AppImages running on systems without jack
 	ADD_LIBRARY(weakjack MODULE weakjack/weak_libjack.c weakjack/weak_libjack.h)
-	TARGET_INCLUDE_DIRECTORIES(weakjack PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/weakjack)
+	TARGET_INCLUDE_DIRECTORIES(weakjack PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/weakjack ${JACK_INCLUDE_DIRS})
 	INSTALL(TARGETS weakjack LIBRARY DESTINATION "${PLUGIN_DIR}/optional")
 ENDIF()