diff --git a/scripts/Makefile.spl b/scripts/Makefile.spl
index e450ffd5d5e..407fc52376a 100644
--- a/scripts/Makefile.spl
+++ b/scripts/Makefile.spl
@@ -314,7 +314,7 @@ endif
 #   - we have either OF_SEPARATE or OF_HOSTFILE
 build_dtb :=
 ifneq ($(CONFIG_$(SPL_TPL_)OF_REAL),)
-ifeq ($(CONFIG_OF_SEPARATE)$(CONFIG_SANDBOX),y)
+ifneq ($(CONFIG_OF_SEPARATE)$(CONFIG_SANDBOX),)
 build_dtb := y
 endif
 endif