diff --git a/mk/docs.mk b/mk/docs.mk
index 71b253379aa..2a5a847d2a4 100644
--- a/mk/docs.mk
+++ b/mk/docs.mk
@@ -87,7 +87,7 @@ endif
 
 # Check for xelatex
 
-ifeq ($(CFG_XELATEX),)
+ifneq ($(CFG_XELATEX),)
     CFG_LATEX := $(CFG_XELATEX)
     XELATEX = 1
   else