diff --git a/configure.in b/configure.in
index a2dd4b33b..fc402d380 100644
--- a/configure.in
+++ b/configure.in
@@ -649,10 +649,13 @@ AC_DEFUN([GUILE_FUNC_DECLARED], [
   fi
 ])
 
-GUILE_FUNC_DECLARED(strptime, time.h)
 GUILE_FUNC_DECLARED(sleep, unistd.h)
 GUILE_FUNC_DECLARED(usleep, unistd.h)
 
+AC_CHECK_DECLS([strptime],,,
+[#define _GNU_SOURCE /* ask glibc to give strptime prototype */
+#include <time.h>])
+
 ### On some systems usleep has no return value.  If it does have one,
 ### we'd like to return it; otherwise, we'll fake it.
 AC_CACHE_CHECK([return type of usleep], guile_cv_func_usleep_return_type,