diff --git a/arch/common/sw_isr_common.c b/arch/common/sw_isr_common.c
index f312bfc96c7..79be8657328 100644
--- a/arch/common/sw_isr_common.c
+++ b/arch/common/sw_isr_common.c
@@ -24,4 +24,21 @@ void z_isr_install(unsigned int irq, void (*routine)(void *), void *param)
 	_sw_isr_table[table_idx].arg = param;
 	_sw_isr_table[table_idx].isr = routine;
 }
+
+/* Some architectures don't/can't interpret flags or priority and have
+ * no more processing to do than this.  Provide a generic fallback.
+ */
+int __weak z_arch_irq_connect_dynamic(unsigned int irq,
+				      unsigned int priority,
+				      void (*routine)(void *),
+				      void *parameter,
+				      u32_t flags)
+{
+	ARG_UNUSED(flags);
+	ARG_UNUSED(priority);
+
+	z_isr_install(irq, routine, parameter);
+	return irq;
+}
+
 #endif /* CONFIG_DYNAMIC_INTERRUPTS */