diff --git a/libgimpbase/gimpparamspecs.c b/libgimpbase/gimpparamspecs.c
index 40135d4169c4011ead94cf26e5d07080172cbd2d..a9bdcc65b1b40760ceda6ccc18e40308f9a9d31a 100644
--- a/libgimpbase/gimpparamspecs.c
+++ b/libgimpbase/gimpparamspecs.c
@@ -1332,7 +1332,7 @@ gimp_param_object_array_get_type (void)
         NULL, NULL,
         (GClassInitFunc) gimp_param_object_array_class_init,
         NULL, NULL,
-        sizeof (GimpParamSpecArray),
+        sizeof (GimpParamSpecObjectArray),
         0,
         (GInstanceInitFunc) gimp_param_object_array_init
       };