diff --git a/src/libsysprof/sysprof-tracefd-source.c b/src/libsysprof/sysprof-tracefd-source.c
index 6cbf1f03..fdd49f81 100644
--- a/src/libsysprof/sysprof-tracefd-source.c
+++ b/src/libsysprof/sysprof-tracefd-source.c
@@ -119,7 +119,7 @@ sysprof_tracefd_source_class_init (SysprofTracefdSourceClass *klass)
                          "Environment Variable",
                          "The environment variable to set",
                          "SYSPROF_TRACE_FD",
-                         (G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));
+                         (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
   
   g_object_class_install_properties (object_class, N_PROPS, properties);
 }