diff --git a/debian/changelog b/debian/changelog
index 7102aaea3..87ed82abe 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -6,7 +6,8 @@ linux (4.17.6-2) UNRELEASED; urgency=medium
   * debian/rules.real: Pass KERNEL_ARCH variable down to debian/rules.d
   * debian/rules.d/tools/perf/Makefile: Use KERNEL_ARCH variable
   * linux-kbuild: Fix the assumed host architecture for cross-built objtool
-    (fixes FTBFS on at least ppc64)
+  * [ppc64] linux-bootwrapper: Work around compiler include path quirk
+    (fixes FTBFS)
 
  -- Ben Hutchings <ben@decadent.org.uk>  Thu, 12 Jul 2018 15:16:15 +0100
 
diff --git a/debian/rules.d/arch/powerpc/boot/Makefile b/debian/rules.d/arch/powerpc/boot/Makefile
index ab8e9d74f..9dc418f26 100644
--- a/debian/rules.d/arch/powerpc/boot/Makefile
+++ b/debian/rules.d/arch/powerpc/boot/Makefile
@@ -9,3 +9,10 @@ SCRIPTS = \
 include $(top_rulesdir)/Makefile.inc
 
 CPPFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
+
+# gcc for ppc64 currently seems to be treating -I like -isystem, and
+# since arch/powerpc/boot has substitute versions of some standard
+# headers for use at boot time, they are also included in these tools.
+# In this case there is actually no need to use the -I option, so
+# filter it out.
+CPPFLAGS := $(filter-out -I%,$(CPPFLAGS))