diff --git a/lisp/Config.x86_solaris_sunc b/lisp/Config.x86_solaris_sunc
index 18dff5d04824675b09d069c67bec62c2bc5e80b3..2b6ed8d3c96c78755015f13d0d2336832223bd50 100644
--- a/lisp/Config.x86_solaris_sunc
+++ b/lisp/Config.x86_solaris_sunc
@@ -4,7 +4,7 @@ include Config.sparc_common
 CC = cc -xlibmieee -g
 CFLAGS += -Di386
 CPP = cc -E
-DEPEND_FLAGS = -xM
+DEPEND_FLAGS = -xM1
 
 ASSEM_SRC = x86-assem.S
 ARCH_SRC = x86-arch.c