diff --git a/Noise/Utilities/Analysis/Corr.mo b/Noise/Utilities/Analysis/Corr.mo
index 45d4b95..b8a9501 100644
--- a/Noise/Utilities/Analysis/Corr.mo
+++ b/Noise/Utilities/Analysis/Corr.mo
@@ -38,6 +38,12 @@ public
   Real int_x2 "The integral of x^2";
   Real int_y2 "The integral of y^2";
   Real int_xy "The integral of x*y";
+initial equation
+  int_x  = 0;
+  int_y  = 0;
+  int_x2 = 0;
+  int_y2 = 0;
+  int_xy = 0;
 equation
   der(int_x)  = if t <= 0 then 0 else x;
   der(int_y)  = if t <= 0 then 0 else y;
diff --git a/Noise/Utilities/Analysis/Mu.mo b/Noise/Utilities/Analysis/Mu.mo
index ae82b86..84e85c6 100644
--- a/Noise/Utilities/Analysis/Mu.mo
+++ b/Noise/Utilities/Analysis/Mu.mo
@@ -9,7 +9,8 @@ protected
   Real mu_0 "Internal integrator variable";
   parameter Real t_0(fixed=false) "Start time";
 initial equation
-  t_0 = time;
+  t_0  = time;
+  mu_0 = 0;
 equation
   der(mu_0) = u;
   mu = if time > t_0 then mu_0/(time-t_0) else u;