diff --git a/src/include/missing_math.h b/src/include/missing_math.h
index 52e72ceb9..cfa9ed42f 100644
--- a/src/include/missing_math.h
+++ b/src/include/missing_math.h
@@ -19,9 +19,11 @@ extern double logb(double);
 #endif
 
 #ifndef HAVE_SCALB
-#  ifndef HAVE_SCALBN
-extern double scalb(double, int);
+extern double scalb(double, double);
 #endif
+
+#ifndef HAVE_SCALBN
+extern double scalbn(double, int);
 #endif
 
 #ifndef HAVE_ISNAN
diff --git a/src/maths/misc/scalb.c b/src/maths/misc/scalb.c
index bd29ab1ee..60c8f82b8 100644
--- a/src/maths/misc/scalb.c
+++ b/src/maths/misc/scalb.c
@@ -4,13 +4,10 @@ Copyright 1991 Regents of the University of California.  All rights reserved.
 
 #include "ngspice.h"
 
-#ifndef HAVE_SCALB
-#  ifdef HAVE_SCALBN
-#    define scalb scalbn
-#  else                       /* Chris Inbody */
+#ifndef HAVE_SCALBN
 
 double
-scalb(double x, int n)
+scalbn(double x, int n)
 {
   double y, z = 1.0, k = 2.0;
   
@@ -28,14 +25,24 @@ scalb(double x, int n)
   
   return x * z;
 }
-#   endif /* HAVE_SCALBN */
-#else /* HAVE_SCALB */
-#  ifndef HAVE_SCALBN
-extern scalb(double x, long n);
-scalbn(double x, int n)
+
+#else /* HAVE_SCALBN */
+
+int Dummy_Symbol_1;
+
+#endif /* HAVE_SCALBN */
+
+
+#ifndef HAVE_SCALB
+
+double
+scalb(double x, double n)
 {
-	return scalb(x, (long)n);
+  return scalbn(x, (int) n);
 }
-#  endif
-int Dummy_Symbol_1;
+
+#else /* HAVE_SCALB */
+
+int Dummy_Symbol_2;
+
 #endif /* HAVE_SCALB */
diff --git a/src/maths/sparse/spsmp.c b/src/maths/sparse/spsmp.c
index 1e0e21883..f93acf349 100644
--- a/src/maths/sparse/spsmp.c
+++ b/src/maths/sparse/spsmp.c
@@ -101,6 +101,10 @@
 #include <spmatrix.h>
 #include "spdefs.h"
 #include <smpdefs.h>
+
+#if defined (_MSC_VER)
+extern double scalbn(double, int);
+#endif
 
 static void LoadGmin(SMPmatrix *eMatrix, double Gmin);