diff --git a/sys/dev/ofw/ofw_if.m b/sys/dev/ofw/ofw_if.m
index d896e00697aa..eff85a21c810 100644
--- a/sys/dev/ofw/ofw_if.m
+++ b/sys/dev/ofw/ofw_if.m
@@ -229,7 +229,7 @@ METHOD int call_method {
 	int		_nargs;
 	int		_nreturns;
 
-	unsigned long	*_args_and_returns;
+	cell_t		*_args_and_returns;
 };
 
 /**
diff --git a/sys/dev/ofw/ofw_standard.c b/sys/dev/ofw/ofw_standard.c
index 5845bf380e1b..e3f8bcc87fa4 100644
--- a/sys/dev/ofw/ofw_standard.c
+++ b/sys/dev/ofw/ofw_standard.c
@@ -95,7 +95,7 @@ static ssize_t ofw_std_package_to_path(ofw_t ofw, phandle_t package, char *buf,
     size_t len);
 static int ofw_std_call_method(ofw_t ofw, ihandle_t instance,
     const char *method, int nargs, int nreturns,
-    unsigned long *args_and_returns);
+    cell_t *args_and_returns);
 static ihandle_t ofw_std_open(ofw_t ofw, const char *device);
 static void ofw_std_close(ofw_t ofw, ihandle_t instance);
 static ssize_t ofw_std_read(ofw_t ofw, ihandle_t instance, void *addr,
@@ -515,7 +515,7 @@ ofw_std_package_to_path(ofw_t ofw, phandle_t package, char *buf, size_t len)
 /*  Call the method in the scope of a given instance. */
 static int
 ofw_std_call_method(ofw_t ofw, ihandle_t instance, const char *method,
-    int nargs, int nreturns, unsigned long *args_and_returns)
+    int nargs, int nreturns, cell_t *args_and_returns)
 {
 	struct {
 		cell_t name;
@@ -529,8 +529,7 @@ ofw_std_call_method(ofw_t ofw, ihandle_t instance, const char *method,
 		2,
 		1,
 	};
-	cell_t *cp;
-	unsigned long *ap;
+	cell_t *cp, *ap;
 	int n;
 
 	if (nargs > 6)
diff --git a/sys/dev/ofw/openfirm.c b/sys/dev/ofw/openfirm.c
index 414b402fab55..241ce8a63695 100644
--- a/sys/dev/ofw/openfirm.c
+++ b/sys/dev/ofw/openfirm.c
@@ -328,14 +328,14 @@ OF_call_method(const char *method, ihandle_t instance, int nargs, int nreturns,
     ...)
 {
 	va_list ap;
-	unsigned long args_n_results[12];
+	cell_t args_n_results[12];
 	int n, status;
 
 	if (nargs > 6)
 		return (-1);
 	va_start(ap, nreturns);
 	for (n = 0; n < nargs; n++)
-		args_n_results[n] = va_arg(ap, unsigned long);
+		args_n_results[n] = va_arg(ap, cell_t);
 
 	status = OFW_CALL_METHOD(ofw_obj, instance, method, nargs, nreturns,
 	    args_n_results);
@@ -343,7 +343,7 @@ OF_call_method(const char *method, ihandle_t instance, int nargs, int nreturns,
 		return (status);
 
 	for (; n < nargs + nreturns; n++)
-		*va_arg(ap, unsigned long *) = args_n_results[n];
+		*va_arg(ap, cell_t *) = args_n_results[n];
 	va_end(ap);
 	return (0);
 }
diff --git a/sys/powerpc/ofw/ofw_real.c b/sys/powerpc/ofw/ofw_real.c
index 04824854a11d..9cde9773d752 100644
--- a/sys/powerpc/ofw/ofw_real.c
+++ b/sys/powerpc/ofw/ofw_real.c
@@ -97,7 +97,7 @@ static ssize_t ofw_real_instance_to_path(ofw_t, ihandle_t instance, char *buf,
 static ssize_t ofw_real_package_to_path(ofw_t, phandle_t package, char *buf, 
     size_t len);
 static int ofw_real_call_method(ofw_t, ihandle_t instance, const char *method, 
-    int nargs, int nreturns, unsigned long *args_and_returns);
+    int nargs, int nreturns, cell_t *args_and_returns);
 static ihandle_t ofw_real_open(ofw_t, const char *device);
 static void ofw_real_close(ofw_t, ihandle_t instance);
 static ssize_t ofw_real_read(ofw_t, ihandle_t instance, void *addr, size_t len);
@@ -652,7 +652,7 @@ ofw_real_package_to_path(ofw_t ofw, phandle_t package, char *buf, size_t len)
 /*  Call the method in the scope of a given instance. */
 static int
 ofw_real_call_method(ofw_t ofw, ihandle_t instance, const char *method, 
-    int nargs, int nreturns, unsigned long *args_and_returns)
+    int nargs, int nreturns, cell_t *args_and_returns)
 {
 	struct {
 		cell_t name;
@@ -666,8 +666,7 @@ ofw_real_call_method(ofw_t ofw, ihandle_t instance, const char *method,
 		2,
 		1,
 	};
-	cell_t *cp;
-	unsigned long *ap;
+	cell_t *cp, *ap;
 	int n;
 
 	if (nargs > 6)