diff --git a/include/execvpe.h b/include/execvpe.h
index d4b65212108a77f669059380d6a0b77c72651b1b..7faa0df5c3a02b68be1040b677041796ad63770e 100644
--- a/include/execvpe.h
+++ b/include/execvpe.h
@@ -16,6 +16,8 @@ __hsunix_execvpe(const char *name, char *const argv[], char *const envp[]);
 #if HAVE_EXECVPE
 # define _GNU_SOURCE
 # include <unistd.h>
+extern int
+execvpe(const char *name, char *const argv[], char *const envp[]);
 #else
 # define execvpe(name,argv,envp) __hsunix_execvpe(name,argv,envp)
 #endif