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-rw-r--r--host/cmake/Modules/UHDBoost.cmake2
1 files changed, 1 insertions, 1 deletions
diff --git a/host/cmake/Modules/UHDBoost.cmake b/host/cmake/Modules/UHDBoost.cmake
index eed94cbfe..51aa1e238 100644
--- a/host/cmake/Modules/UHDBoost.cmake
+++ b/host/cmake/Modules/UHDBoost.cmake
@@ -65,7 +65,7 @@ unset(Boost_LIBRARIES)
# check whether to set REQUIRED or not
# if not set, default is to require Boost
-if(NOT UHD_BOOST_REQUIRED)
+if(NOT DEFINED UHD_BOOST_REQUIRED)
# UHD_BOOST_REQUIRED is not set; use the default
set(UHD_BOOST_REQUIRED "REQUIRED")
elseif(UHD_BOOST_REQUIRED)