diff --git a/nc_test/tst_big_rvar.c b/nc_test/tst_big_rvar.c
index b1e19fbd2..8f8db0da5 100644
--- a/nc_test/tst_big_rvar.c
+++ b/nc_test/tst_big_rvar.c
@@ -36,7 +36,7 @@
 #define DIM3 2000		/* DIM1*DIM2*DIM3 > 2**32 */
 
 
-static void
+static int
 test_big_var(const char *testfile) 
 {
     int ncid, varid, dimids[NUMDIMS];
@@ -105,6 +105,7 @@ test_big_var(const char *testfile)
 	    }
 	}
     if (nc_close(ncid)) ERR;
+    return 0;
 }
 
 int
diff --git a/nc_test/tst_big_var.c b/nc_test/tst_big_var.c
index 346ce341b..6ba5f197e 100644
--- a/nc_test/tst_big_var.c
+++ b/nc_test/tst_big_var.c
@@ -34,7 +34,7 @@
  * when creating a byte variable for which the product of dimensions
  * is greater than 2**32.  Check that this bug has been fixed.
  */
-static void
+static int
 test_big_var(const char *testfile) 
 {
     int ncid, varid, dimids[NUMDIMS];
@@ -60,6 +60,7 @@ test_big_var(const char *testfile)
     if (nc_get_var1_int(ncid, varid, index, &nval_in)) ERR;
     if (nval != nval_in) ERR;
     if (nc_close(ncid)) ERR;
+    return 0;
 }
 
 int
diff --git a/nc_test/tst_large.c b/nc_test/tst_large.c
index cd46a7750..8e0ce595c 100644
--- a/nc_test/tst_large.c
+++ b/nc_test/tst_large.c
@@ -33,7 +33,7 @@
  * creating a variable for which the product of dimensions is exactly
  * 2**32.  Check that this bug has been fixed. 
  */
-static void
+static int
 test_big_var(const char *testfile) {
     int ncid, varid, dimids[NUMDIMS];
     int cflag = NC_CLOBBER;
@@ -63,9 +63,10 @@ test_big_var(const char *testfile) {
     if (nval != nval_in)
 	ERR;
     if (nc_close(ncid)) ERR;
+    return 0;
 }
 
-static void
+static int
 test_large_byte_var(const char *testfile) {
     int ncid, varid, dimids[NUMDIMS];
     size_t index[NUMDIMS] = {0, 0};
@@ -102,9 +103,10 @@ test_large_byte_var(const char *testfile) {
     if (char_val_in != 99)	/* see above, the value written when start[0]==0, j==0 */
 	ERR;
     if (nc_close(ncid)) ERR;
+    return 0;
 }
 
-static void
+static int
 test_large_short_var(const char *testfile) {
     int ncid, varid, dimids[NUMDIMS];
     int int_val_in, int_val_out = 99;
@@ -133,6 +135,7 @@ test_large_short_var(const char *testfile) {
 	ERR;
 #endif
     if (nc_close(ncid)) ERR;
+    return 0;
 }
 
 #define FILE_NAME "tst_large.nc"