diff --git a/src/ofxstatement/ofx.py b/src/ofxstatement/ofx.py
index 862cebe..888c7d5 100644
--- a/src/ofxstatement/ofx.py
+++ b/src/ofxstatement/ofx.py
@@ -260,7 +260,11 @@ def buildInvestTransaction(self, line: InvestStatementLine) -> None:
             line.unit_price,
             precision=self.invest_transactions_float_precision,
         )
-        self.buildAmount("UNITS", line.units)
+        self.buildAmount(
+            "UNITS",
+            line.units,
+            precision=self.invest_transactions_float_precision,
+        )
 
         self.buildAmount(
             "TOTAL",
diff --git a/src/ofxstatement/tests/test_ofx_invest.py b/src/ofxstatement/tests/test_ofx_invest.py
index 9ad30c5..433a5af 100644
--- a/src/ofxstatement/tests/test_ofx_invest.py
+++ b/src/ofxstatement/tests/test_ofx_invest.py
@@ -87,7 +87,7 @@
                             <SUBACCTFUND>OTHER</SUBACCTFUND>
                             <FEES>1.24000</FEES>
                             <UNITPRICE>138.28000</UNITPRICE>
-                            <UNITS>3.00</UNITS>
+                            <UNITS>3.00000</UNITS>
                             <TOTAL>-416.08000</TOTAL>
                         </INVBUY>
                     </BUYSTOCK>
@@ -107,7 +107,7 @@
                             <SUBACCTFUND>OTHER</SUBACCTFUND>
                             <FEES>0.28000</FEES>
                             <UNITPRICE>225.63000</UNITPRICE>
-                            <UNITS>-5.00</UNITS>
+                            <UNITS>-5.00000</UNITS>
                             <TOTAL>1127.87000</TOTAL>
                         </INVSELL>
                     </SELLSTOCK>