diff --git a/arch/arm/src/imxrt/imxrt_timerisr.c b/arch/arm/src/imxrt/imxrt_timerisr.c
index e648900d5bc..8e1e5af1c04 100644
--- a/arch/arm/src/imxrt/imxrt_timerisr.c
+++ b/arch/arm/src/imxrt/imxrt_timerisr.c
@@ -87,7 +87,7 @@
  * Private Function Prototypes
  ****************************************************************************/
 
-static int imxrt_timerisr(int irq, uint32_t *regs, void *arg)'
+static int imxrt_timerisr(int irq, uint32_t *regs, void *arg);
 
 #ifdef CONFIG_PM
 static void up_pm_notify(struct pm_callback_s *cb, int dowmin,