diff --git a/boards/stm32f4discovery/include/periph_conf.h b/boards/stm32f4discovery/include/periph_conf.h
index 19f90b2159..4b0b9366bb 100644
--- a/boards/stm32f4discovery/include/periph_conf.h
+++ b/boards/stm32f4discovery/include/periph_conf.h
@@ -166,14 +166,16 @@ static const pwm_conf_t pwm_config[] = {
         .af       = GPIO_AF1,
         .bus      = APB2
     },
-    // {
-    //     .dev      = TIM3,
-    //     .rcc_mask = RCC_APB1ENR_TIM3EN,
-    //     .chan     = { GPIO_PIN(PORT_B, 4), GPIO_PIN(PORT_B, 5),
-    //                   GPIO_PIN(PORT_B, 0), GPIO_PIN(PORT_B, 1) },
-    //     .af       = GPIO_AF2,
-    //     .bus      = APB1
-    // }
+    {
+        .dev      = TIM3,
+        .rcc_mask = RCC_APB1ENR_TIM3EN,
+        .chan     = { { .pin = GPIO_PIN(PORT_B, 4), .cc_chan = 0 },
+                      { .pin = GPIO_PIN(PORT_B, 5), .cc_chan = 1 },
+                      { .pin = GPIO_PIN(PORT_B, 0), .cc_chan = 2 },
+                      { .pin = GPIO_PIN(PORT_B, 1), .cc_chan = 3 } },
+        .af       = GPIO_AF2,
+        .bus      = APB1
+    }
 };
 
 #define PWM_NUMOF           (sizeof(pwm_config) / sizeof(pwm_config[0]))