diff --git a/extern/libmv/CMakeLists.txt b/extern/libmv/CMakeLists.txt
index 6a4a61ea779..09c36fc4383 100644
--- a/extern/libmv/CMakeLists.txt
+++ b/extern/libmv/CMakeLists.txt
@@ -64,7 +64,7 @@ if(WITH_LIBMV)
 		../../intern/guardedalloc
 	)
 
-	set(INC_SYS
+	list(APPEND INC_SYS
 		../Eigen3
 		${PNG_INCLUDE_DIRS}
 		${ZLIB_INCLUDE_DIRS}
diff --git a/extern/libmv/bundle.sh b/extern/libmv/bundle.sh
index 2e5fe5ad1af..f352f77373b 100755
--- a/extern/libmv/bundle.sh
+++ b/extern/libmv/bundle.sh
@@ -157,7 +157,7 @@ if(WITH_LIBMV)
 		../../intern/guardedalloc
 	)
 
-	set(INC_SYS
+	list(APPEND INC_SYS
 		../Eigen3
 		\${PNG_INCLUDE_DIR}
 		\${ZLIB_INCLUDE_DIRS}