diff --git a/CMakeLists.txt b/CMakeLists.txt
index acc7b20c..8abc8943 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -60,7 +60,9 @@ macro(pip_module NAME LIBS LABEL INCLUDES MSG)
 	file(GLOB_RECURSE HS   "libs/${NAME}/*.h")
 	file(GLOB_RECURSE PHS  "libs/${NAME}/*_p.h")
 	file(GLOB_RECURSE RES  "libs/${NAME}/*.conf")
-	list(REMOVE_ITEM HS "${PHS}")
+	if (NOT "x${PHS}" STREQUAL "x")
+		list(REMOVE_ITEM HS ${PHS})
+	endif()
 	list(APPEND HDRS ${HS})
 	list(APPEND PHDRS ${PHS})