diff --git a/firmware/Makefile b/firmware/Makefile
index 020e629a615cea43c705aa4bb40e3c0384f3161a..99955ed8b198a7877be6a9822ec2c6ed808d322b 100644
--- a/firmware/Makefile
+++ b/firmware/Makefile
@@ -142,7 +142,7 @@ fw-shipped-$(CONFIG_YAM) += yam/1200.bin yam/9600.bin
 fw-shipped-all := $(fw-shipped-y) $(fw-shipped-m) $(fw-shipped-)
 
 # Directories which we _might_ need to create, so we have a rule for them.
-firmware-dirs := $(sort $(patsubst %,$(objtree)/$(obj)/%/,$(dir $(fw-external-y) $(fw-shipped-all))))
+firmware-dirs := $(sort $(addprefix $(objtree)/$(obj)/,$(dir $(fw-external-y) $(fw-shipped-all))))
 
 quiet_cmd_mkdir = MKDIR   $(patsubst $(objtree)/%,%,$@)
       cmd_mkdir = mkdir -p $@
diff --git a/scripts/mkmakefile b/scripts/mkmakefile
index 67d59c7a18dc57b1580a833ed37e832eff227c85..5325423ceab483833c8f09efb37a336aaa8f9588 100644
--- a/scripts/mkmakefile
+++ b/scripts/mkmakefile
@@ -44,7 +44,9 @@ all:
 
 Makefile:;
 
-\$(all) %/: all
+\$(all): all
 	@:
 
+%/: all
+	@:
 EOF