diff --git a/src/libCom/test/epicsMathTest.c b/src/libCom/test/epicsMathTest.c
index fe270ce5f..60ad94740 100644
--- a/src/libCom/test/epicsMathTest.c
+++ b/src/libCom/test/epicsMathTest.c
@@ -22,7 +22,7 @@
 
 static char *truth[2] = {"false","true"};
 
-void epicsMathTest ()
+int epicsMathTest ()
 {
     double a,b,c;
 
@@ -41,4 +41,5 @@ void epicsMathTest ()
     a=1e300; b=1e300; c=a/b;
     printf("a %e b %e c %e isnan %s isinf %s\n",
         a,b,c,truth[isnan(c) ? 1 : 0],truth[isinf(c) ? 1 : 0]);
+    return(0);
 }
diff --git a/src/libCom/test/epicsMathTestMain.cpp b/src/libCom/test/epicsMathTestMain.cpp
index 5f90e0e58..457e98808 100644
--- a/src/libCom/test/epicsMathTestMain.cpp
+++ b/src/libCom/test/epicsMathTestMain.cpp
@@ -13,7 +13,7 @@
  */
 
 extern "C" {
-void epicsMathTest ( void );
+int epicsMathTest ( void );
 }
 
 int main ( int  , char *[] )