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-rw-r--r--src/test/blockchain_tests.cpp2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/test/blockchain_tests.cpp b/src/test/blockchain_tests.cpp
index be515a9eac..9b8f419290 100644
--- a/src/test/blockchain_tests.cpp
+++ b/src/test/blockchain_tests.cpp
@@ -11,6 +11,8 @@
#include <cstdlib>
+using util::ToString;
+
/* Equality between doubles is imprecise. Comparison should be done
* with a small threshold of tolerance, rather than exact equality.
*/