diff --git a/m4/guestfs-c.m4 b/m4/guestfs-c.m4
index ad5930fce..7dade5de9 100644
--- a/m4/guestfs-c.m4
+++ b/m4/guestfs-c.m4
@@ -20,7 +20,7 @@ dnl Define the host CPU architecture (defines 'host_cpu')
 AC_CANONICAL_HOST
 
 dnl Check for basic C environment.
-AC_PROG_CC_STDC
+AC_PROG_CC
 AC_PROG_INSTALL
 AC_PROG_CPP