diff --git a/genode/Tupfile b/genode/Tupfile
index c3eecef..0b145dd 100644
--- a/genode/Tupfile
+++ b/genode/Tupfile
@@ -1,3 +1,3 @@
 TARGET_NAME = blobsets
 include_rules
-include $(NIMBLE_BINARIES_INCLUDE)
+include &(NIMBLE_BINARIES_INCLUDE)
diff --git a/genode/runtimes/blobsets_fs/Tupfile b/genode/runtimes/blobsets_fs/Tupfile
index 3c348ab..988cd49 100644
--- a/genode/runtimes/blobsets_fs/Tupfile
+++ b/genode/runtimes/blobsets_fs/Tupfile
@@ -5,4 +5,4 @@ PKG_DEPENDS += \
 	_/src/blobsets \
 
 include_rules
-include $(NIMBLE_PACKAGE_INCLUDE)
+include &(NIMBLE_PACKAGE_INCLUDE)
diff --git a/genode/runtimes/blobsets_http/Tupfile b/genode/runtimes/blobsets_http/Tupfile
index 1b361f0..4b5fc83 100644
--- a/genode/runtimes/blobsets_http/Tupfile
+++ b/genode/runtimes/blobsets_http/Tupfile
@@ -7,4 +7,4 @@ PKG_DEPENDS += \
 	_/src/blobsets \
 
 include_rules
-include $(NIMBLE_PACKAGE_INCLUDE)
+include &(NIMBLE_PACKAGE_INCLUDE)