diff --git a/ci/scripts/cpp_build.sh b/ci/scripts/cpp_build.sh
index b2dd1631cc3f1..2ef9c0ee225ea 100755
--- a/ci/scripts/cpp_build.sh
+++ b/ci/scripts/cpp_build.sh
@@ -84,12 +84,12 @@ cmake \
   -DARROW_CSV=${ARROW_CSV:-ON} \
   -DARROW_CUDA=${ARROW_CUDA:-OFF} \
   -DARROW_CXXFLAGS=${ARROW_CXXFLAGS:-} \
-  -DARROW_CXX_FLAGS_DEBUG=${ARROW_CXX_FLAGS_DEBUG:-} \
-  -DARROW_CXX_FLAGS_RELEASE=${ARROW_CXX_FLAGS_RELEASE:-} \
-  -DARROW_CXX_FLAGS_RELWITHDEBINFO=${ARROW_CXX_FLAGS_RELWITHDEBINFO:-} \
-  -DARROW_C_FLAGS_DEBUG=${ARROW_C_FLAGS_DEBUG:-} \
-  -DARROW_C_FLAGS_RELEASE=${ARROW_C_FLAGS_RELEASE:-} \
-  -DARROW_C_FLAGS_RELWITHDEBINFO=${ARROW_C_FLAGS_RELWITHDEBINFO:-} \
+  -DARROW_CXX_FLAGS_DEBUG="${ARROW_CXX_FLAGS_DEBUG:-}" \
+  -DARROW_CXX_FLAGS_RELEASE="${ARROW_CXX_FLAGS_RELEASE:-}" \
+  -DARROW_CXX_FLAGS_RELWITHDEBINFO="${ARROW_CXX_FLAGS_RELWITHDEBINFO:-}" \
+  -DARROW_C_FLAGS_DEBUG="${ARROW_C_FLAGS_DEBUG:-}" \
+  -DARROW_C_FLAGS_RELEASE="${ARROW_C_FLAGS_RELEASE:-}" \
+  -DARROW_C_FLAGS_RELWITHDEBINFO="${ARROW_C_FLAGS_RELWITHDEBINFO:-}" \
   -DARROW_DATASET=${ARROW_DATASET:-ON} \
   -DARROW_DEPENDENCY_SOURCE=${ARROW_DEPENDENCY_SOURCE:-AUTO} \
   -DARROW_ENABLE_TIMING_TESTS=${ARROW_ENABLE_TIMING_TESTS:-ON} \