diff --git a/R/backend-mssql.R b/R/backend-mssql.R
index 1850e6d89..1415151f7 100644
--- a/R/backend-mssql.R
+++ b/R/backend-mssql.R
@@ -294,7 +294,8 @@ simulate_mssql <- function(version = "15.0") {
       is.na         = mssql_is_null,
 
       runif = function(n = n(), min = 0, max = 1) {
-        sql_runif(RAND(), n = {{ n }}, min = min, max = max)
+        # https://stackoverflow.com/a/9039661
+        sql_runif(RAND(CHECKSUM(NEWID())), n = {{ n }}, min = min, max = max)
       },
 
       # string functions ------------------------------------------------
@@ -659,4 +660,4 @@ bit_to_boolean <- function(x_expr) {
   }
 }
 
-utils::globalVariables(c("BIT", "CAST", "%AS%", "%is%", "convert", "DATE", "DATEADD", "DATEFROMPARTS", "DATEDIFF", "DATENAME", "DATEPART", "IIF", "NOT", "SUBSTRING", "LTRIM", "RTRIM", "CHARINDEX", "SYSDATETIME", "SECOND", "MINUTE", "HOUR", "DAY", "DAYOFWEEK", "DAYOFYEAR", "MONTH", "QUARTER", "YEAR", "BIGINT", "INT", "%AND%", "%BETWEEN%"))
+utils::globalVariables(c("BIT", "CAST", "%AS%", "%is%", "convert", "DATE", "DATEADD", "DATEFROMPARTS", "DATEDIFF", "DATENAME", "DATEPART", "IIF", "NOT", "SUBSTRING", "LTRIM", "RTRIM", "CHARINDEX", "SYSDATETIME", "SECOND", "MINUTE", "HOUR", "DAY", "DAYOFWEEK", "DAYOFYEAR", "MONTH", "QUARTER", "YEAR", "BIGINT", "INT", "%AND%", "%BETWEEN%", "CHECKSUM", "NEWID"))
diff --git a/tests/testthat/_snaps/backend-mssql.md b/tests/testthat/_snaps/backend-mssql.md
index f17f8175c..0fd81d2a8 100644
--- a/tests/testthat/_snaps/backend-mssql.md
+++ b/tests/testthat/_snaps/backend-mssql.md
@@ -231,7 +231,7 @@
       <SQL>
       SELECT `x`
       FROM (
-        SELECT `df`.*, ROW_NUMBER() OVER (ORDER BY RAND()) AS `col01`
+        SELECT `df`.*, ROW_NUMBER() OVER (ORDER BY RAND(CHECKSUM(NEWID()))) AS `col01`
         FROM `df`
       ) AS `q01`
       WHERE (`col01` <= 1)