diff --git a/src/bitcoin-tx.cpp b/src/bitcoin-tx.cpp
index 99889a3e96..0eb122f086 100644
--- a/src/bitcoin-tx.cpp
+++ b/src/bitcoin-tx.cpp
@@ -383,13 +383,16 @@ static void MutateTxAddOutData(CMutableTransaction& tx, const std::string& strIn
     if (pos==0)
         throw std::runtime_error("TX output value not specified");
 
-    if (pos != std::string::npos) {
+    if (pos == std::string::npos) {
+        pos = 0;
+    } else {
         // Extract and validate VALUE
         value = ExtractAndValidateValue(strInput.substr(0, pos));
+        ++pos;
     }
 
     // extract and validate DATA
-    std::string strData = strInput.substr(pos + 1, std::string::npos);
+    const std::string strData{strInput.substr(pos, std::string::npos)};
 
     if (!IsHex(strData))
         throw std::runtime_error("invalid TX output data");
diff --git a/test/sanitizer_suppressions/ubsan b/test/sanitizer_suppressions/ubsan
index e1a49e9544..e3e64d50f3 100644
--- a/test/sanitizer_suppressions/ubsan
+++ b/test/sanitizer_suppressions/ubsan
@@ -21,7 +21,6 @@ unsigned-integer-overflow:addrman.cpp
 unsigned-integer-overflow:arith_uint256.h
 unsigned-integer-overflow:basic_string.h
 unsigned-integer-overflow:bench/bench.h
-unsigned-integer-overflow:bitcoin-tx.cpp
 unsigned-integer-overflow:bloom.cpp
 unsigned-integer-overflow:chain.cpp
 unsigned-integer-overflow:chain.h