diff --git a/util/manibuilder/Makefile b/util/manibuilder/Makefile
index aff150f..294bc28 100644
--- a/util/manibuilder/Makefile
+++ b/util/manibuilder/Makefile
@@ -67,7 +67,8 @@
 		 $(if $(STRIP),STRIP='$(STRIP)') \
 		 $(if $(LIBS_BASE),LIBS_BASE='$(LIBS_BASE)') \
 		 $(MAKEARGS)" \
-		$(if $(QUIET_TEST),>/dev/null 2>&1) || echo $*: $$?
+		$(if $(QUIET_TEST),>/dev/null 2>&1) \
+			|| { RET=$$?; echo $*: $${RET}; exit $${RET}; }
 
 $(addsuffix -shell,$(ALL_TAGS)): %-shell: %-check-build
 	$(QUIET_SETUP)\
diff --git a/util/manibuilder/README.md b/util/manibuilder/README.md
index b00d618..ece2317 100644
--- a/util/manibuilder/README.md
+++ b/util/manibuilder/README.md
@@ -46,7 +46,7 @@
     $ make register
     [...]
     $ # run the default target:
-    $ make -j4
+    $ make -j4 -k 2>/dev/null
     debian-debootstrap:mips-stretch: 2
     debian-debootstrap:mips-sid: 2
     debian-debootstrap:mips-buster: 2
@@ -56,7 +56,8 @@
 For each *tag* that returns with a non-zero exit code, the *tag*
 and actual exit code is printed. An exit code of `2` is most likely
 as that is what *make* returns on failure. Other exit codes might
-hint towards a problem in the setup. Failing *tags* can then be
+hint towards a problem in the setup. The `-k` lets *make* continue
+running all *tags* even if one failed. Failing *tags* can then be
 investigated individually with the <tag>-shell target, e.g.:
 
     $ make debian-debootstrap:mips-sid-shell