diff --git a/ChangeLog b/ChangeLog
index 9e4cee9..649e1a9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2007-03-31  Bruno Haible  <bruno@clisp.org>
+
+	* tests/test.c (in_word_set): New declaration.
+	* tests/test2.c (in_word_set): Likewise.
+
 2007-03-31  Bruno Haible  <bruno@clisp.org>
 
 	* src/options.cc (Options::parse_options): Bump copyright year.
diff --git a/tests/test.c b/tests/test.c
index fcb120c..6ee16e0 100644
--- a/tests/test.c
+++ b/tests/test.c
@@ -7,6 +7,12 @@
 #include <stdio.h>
 #include <string.h>
 
+#if defined __STDC__ || defined __cplusplus
+extern char * in_word_set (const char *, int);
+#else
+extern char * in_word_set ();
+#endif
+
 #define MAX_LEN 80
 
 int
diff --git a/tests/test2.c b/tests/test2.c
index 1cc8633..2a2c36d 100644
--- a/tests/test2.c
+++ b/tests/test2.c
@@ -20,6 +20,12 @@
 # define SET_BINARY(f) (void)0
 #endif
 
+#if defined __STDC__ || defined __cplusplus
+extern struct language * in_word_set (const char *, int);
+#else
+extern struct language * in_word_set ();
+#endif
+
 #define MAX_LEN 80
 
 int