diff --git a/src/postgres/interface.c b/src/postgres/interface.c
index 4b33252e4..52f91977f 100644
--- a/src/postgres/interface.c
+++ b/src/postgres/interface.c
@@ -619,7 +619,7 @@ pgLsnToWalSegment(uint32_t timeline, uint64_t lsn, unsigned int walSegmentSize)
     FUNCTION_TEST_END();
 
     FUNCTION_TEST_RETURN(
-        strNewFmt("%08X%08X%08X", timeline, (unsigned int)(lsn >> 32), (unsigned int)(lsn & 0xFFFFFFFF / walSegmentSize)));
+        strNewFmt("%08X%08X%08X", timeline, (unsigned int)(lsn >> 32), (unsigned int)(lsn & 0xFFFFFFFF) / walSegmentSize));
 }
 
 /**********************************************************************************************************************************/
diff --git a/test/src/module/postgres/interfaceTest.c b/test/src/module/postgres/interfaceTest.c
index a421491a3..6e0dfa907 100644
--- a/test/src/module/postgres/interfaceTest.c
+++ b/test/src/module/postgres/interfaceTest.c
@@ -114,6 +114,7 @@ testRun(void)
 
         TEST_RESULT_STR_Z(pgLsnToWalSegment(1, 0xFFFFFFFFAAAAAAAA, 0x1000000), "00000001FFFFFFFF000000AA", "lsn to wal segment");
         TEST_RESULT_STR_Z(pgLsnToWalSegment(1, 0xFFFFFFFFAAAAAAAA, 0x40000000), "00000001FFFFFFFF00000002", "lsn to wal segment");
+        TEST_RESULT_STR_Z(pgLsnToWalSegment(1, 0xFFFFFFFF40000000, 0x40000000), "00000001FFFFFFFF00000001", "lsn to wal segment");
     }
 
     // *****************************************************************************************************************************