diff --git a/Buildings/UsersGuide/ReleaseNotes/Version_12_0_0.mo b/Buildings/UsersGuide/ReleaseNotes/Version_12_0_0.mo
index 36d2ea6f2c3..545f3590976 100644
--- a/Buildings/UsersGuide/ReleaseNotes/Version_12_0_0.mo
+++ b/Buildings/UsersGuide/ReleaseNotes/Version_12_0_0.mo
@@ -286,12 +286,15 @@ that do not lead to wrong simulation results, e.g.,
units are wrong or errors in documentation):
-
xxx
+
Buildings.Controls.OBC.CDL
-
xxx
+
Buildings.Utilities.Math.Functions.round
-
xxx.
+
Removed wrong parameter declaration which causes an error in
+ Dymola 2025x beta1.
+ This is for
+ #3978.
diff --git a/Buildings/Utilities/Math/Functions/round.mo b/Buildings/Utilities/Math/Functions/round.mo
index 3d279ba5dcf..6523d1bc05a 100644
--- a/Buildings/Utilities/Math/Functions/round.mo
+++ b/Buildings/Utilities/Math/Functions/round.mo
@@ -7,7 +7,7 @@ function round "Round real number to specified digits"
output Real y "Connector of Real output signal";
protected
- parameter Real fac = 10^n "Factor used for rounding";
+ Real fac = 10^n "Factor used for rounding";
algorithm
y := if (x>0) then floor(x*fac + 0.5)/fac else ceil(x*fac - 0.5)/fac;
@@ -46,6 +46,13 @@ Buildings.Controls.OBC.CDL.Reals.Round.