diff --git a/bootstrap b/bootstrap
index f5f8aafc3..2eba6a712 100755
--- a/bootstrap
+++ b/bootstrap
@@ -50,6 +50,7 @@ gnulib_tool=$GNULIB_SRCDIR/gnulib-tool
 (cd daemon && mkdir -p tests lib && ../$gnulib_tool --update)
 
 modules='
+asprintf
 closeout
 gitlog-to-changelog
 gnu-make
@@ -58,8 +59,12 @@ ignore-value
 maintainer-makefile
 manywarnings
 progname
-warnings
+strchrnul
+strerror
+strndup
+vasprintf
 vc-list-files
+warnings
 '
 
 $gnulib_tool			\
diff --git a/fish/destpaths.c b/fish/destpaths.c
index 275db49a6..1e42ae80d 100644
--- a/fish/destpaths.c
+++ b/fish/destpaths.c
@@ -18,8 +18,6 @@
 
 #include <config.h>
 
-#define _GNU_SOURCE		// for strndup, asprintf
-
 #include <stdio.h>
 #include <stdlib.h>
 #include <stddef.h>
diff --git a/fish/fish.c b/fish/fish.c
index a75881068..a4069d6dc 100644
--- a/fish/fish.c
+++ b/fish/fish.c
@@ -18,8 +18,6 @@
 
 #include <config.h>
 
-#define _GNU_SOURCE // for strchrnul
-
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/src/guestfs.c b/src/guestfs.c
index 204125b9e..145f0f39a 100644
--- a/src/guestfs.c
+++ b/src/guestfs.c
@@ -19,7 +19,6 @@
 #include <config.h>
 
 #define _BSD_SOURCE /* for mkdtemp, usleep */
-#define _GNU_SOURCE /* for vasprintf, GNU strerror_r, strchrnul */
 
 #include <stdio.h>
 #include <stdlib.h>