diff --git a/debian/changelog b/debian/changelog
index 66d31f63..3730dd32 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,6 +1,9 @@
 libgtop2 (2.28.5-2) UNRELEASED; urgency=low
 
   * Add explicit Build-Depends on libbsd-dev for kfreebsd.
+  * Add `pkg-config --cflags libbsd-overlay` to CPPFLAGS on kfreebsd. This
+    let's code expecting bsd headers on bsd work without patching. Thanks
+    Julien Cristau for the suggestion. Closes: #721886
 
  -- Michael Biebl <biebl@debian.org>  Sun, 08 Sep 2013 14:22:12 +0200
 
diff --git a/debian/rules b/debian/rules
index a7024411..1f4d010e 100755
--- a/debian/rules
+++ b/debian/rules
@@ -13,6 +13,10 @@ SHARED_PKG := libgtop2-7
 
 LDFLAGS += -Wl,-z,defs -Wl,-O1 -Wl,--as-needed
 
+ifeq ($(DEB_HOST_ARCH_OS),kfreebsd)
+CPPFLAGS += $(shell pkg-config --cflags libbsd-overlay)
+endif
+
 DEB_DH_AUTORECONF_ARGS = --as-needed
 
 DEB_DH_MAKESHLIBS_ARGS_ALL += -V '$(SHARED_PKG) (>= 2.24.0)'