--- a/Makefile.am
+++ b/Makefile.am
@@ -136,11 +136,11 @@
 EXTRA_DIST += tools/yasm-filter.sh tools/nasm-filter.sh
 EXTRA_DIST += tools/yasm-cet-filter.sh tools/nasm-cet-filter.sh
 
-AM_CFLAGS = ${my_CFLAGS} ${INCLUDE} $(src_include) ${ARCH} ${D}
+AM_CFLAGS = ${my_CFLAGS} ${INCLUDE} $(src_include) ${ARCH} ${DIST_D}
 if CPU_AARCH64
 AM_CCASFLAGS = ${AM_CFLAGS}
 else
-AM_CCASFLAGS = ${yasm_args} ${INCLUDE} ${src_include} ${DEFS} ${D}
+AM_CCASFLAGS = ${yasm_args} ${INCLUDE} ${src_include} ${DEFS} ${DIST_D}
 endif
 
 .asm.s: