diff --git a/Makefile.inc1 b/Makefile.inc1
index 8f1ee1a17d0a..09c188ba9f19 100644
--- a/Makefile.inc1
+++ b/Makefile.inc1
@@ -1238,9 +1238,8 @@ _clang_tblgen= \
 .endif
 
 # dtrace tools are required for older bootstrap env and cross-build
-.if ${MK_CDDL} != "no" && \
-    ((${BOOTSTRAPPING} < 1000034 && \
-          !(${BOOTSTRAPPING} >= 901505 && ${BOOTSTRAPPING} < 999999)) \
+# pre libdwarf
+.if ${MK_CDDL} != "no" && (${BOOTSTRAPPING} < 1100006 \
       || (${MACHINE} != ${TARGET} || ${MACHINE_ARCH} != ${TARGET_ARCH}))
 _dtrace_tools= cddl/usr.bin/sgsmsg cddl/lib/libctf lib/libelf \
     lib/libdwarf cddl/usr.bin/ctfconvert cddl/usr.bin/ctfmerge