diff --git a/openbsc/src/e1_input.c b/openbsc/src/e1_input.c
index 2d0c134..7531755 100644
--- a/openbsc/src/e1_input.c
+++ b/openbsc/src/e1_input.c
@@ -370,10 +370,6 @@
 	if (ts->type != E1INP_TS_TYPE_SIGN)
 		return NULL;
 
-	if (!tall_sigl_ctx)
-		tall_sigl_ctx = talloc_named_const(tall_bsc_ctx, 1,
-						   "e1inp_sign_link");
-
 	link = talloc_zero(tall_sigl_ctx, struct e1inp_sign_link);
 	if (!link)
 		return NULL;
@@ -505,3 +501,9 @@
 	
 	return 0;
 }
+
+static __attribute__((constructor)) void on_dso_load_e1_inp(void)
+{
+	tall_sigl_ctx = talloc_named_const(tall_bsc_ctx, 1,
+					   "e1inp_sign_link");
+}