--- a/Makefile.am
+++ b/Makefile.am
@@ -121,11 +121,11 @@ CCAS = $(as_filter)
 EXTRA_DIST += tools/nasm-filter.sh
 EXTRA_DIST += tools/nasm-cet-filter.sh
 
-AM_CFLAGS = ${my_CFLAGS} ${INCLUDE} $(src_include) ${D}
+AM_CFLAGS = ${my_CFLAGS} ${INCLUDE} $(src_include) ${DIST_D}
 if CPU_AARCH64
-AM_CCASFLAGS = ${asm_args} ${INCLUDE} $(src_include) ${D}
+AM_CCASFLAGS = ${asm_args} ${INCLUDE} $(src_include) ${DIST_D}
 else
-AM_CCASFLAGS = ${asm_args} ${INCLUDE} $(src_include) ${DEFS} ${D}
+AM_CCASFLAGS = ${asm_args} ${INCLUDE} $(src_include) ${DEFS} ${DIST_D}
 endif
 
 .asm.s: