diff --git a/src/runtime/asm_s390x.s b/src/runtime/asm_s390x.s
index 70e3b5e..9ed4d91 100644
--- a/src/runtime/asm_s390x.s
+++ b/src/runtime/asm_s390x.s
@@ -279,13 +279,15 @@
 	// Cannot grow scheduler stack (m->g0).
 	MOVD	g_m(g), R7
 	MOVD	m_g0(R7), R8
-	CMPBNE	g, R8, 2(PC)
+	CMPBNE	g, R8, 3(PC)
+	BL	runtime·badmorestackg0(SB)
 	BL	runtime·abort(SB)
 
 	// Cannot grow signal stack (m->gsignal).
 	MOVD	m_gsignal(R7), R8
 	CMP	g, R8
-	BNE	2(PC)
+	BNE	3(PC)
+	BL	runtime·badmorestackgsignal(SB)
 	BL	runtime·abort(SB)
 
 	// Called from f.