diff --git a/drivers/ccs811/ccs811.c b/drivers/ccs811/ccs811.c
index 86251f72aa..891a46d7fd 100644
--- a/drivers/ccs811/ccs811.c
+++ b/drivers/ccs811/ccs811.c
@@ -530,8 +530,7 @@ static int _reg_read(const ccs811_t *dev, uint8_t reg, uint8_t *data, uint32_t l
     }
     else {
         DEBUG_DEV("could not read %"PRIu32" bytes from sensor registers "
-                  "starting at addr %02x, reason %d (%s)",
-                  dev, len, reg, res, strerror(res * -1));
+                  "starting at addr %02x, reason %i", dev, len, reg, res);
         return -CCS811_ERROR_I2C;
     }
 
@@ -587,8 +586,7 @@ static int _reg_write(const ccs811_t *dev, uint8_t reg, uint8_t *data, uint32_t
 
     if (res != CCS811_OK) {
         DEBUG_DEV("could not write %"PRIu32" bytes to sensor registers "
-                  "starting at addr %02x, reason %i (%s)",
-                  dev, len, reg, res, strerror(res * -1));
+                  "starting at addr %02x, reason %i", dev, len, reg, res);
         return -CCS811_ERROR_I2C;
     }
 
diff --git a/drivers/include/ccs811.h b/drivers/include/ccs811.h
index 4a4a4f533f..9983e96e52 100644
--- a/drivers/include/ccs811.h
+++ b/drivers/include/ccs811.h
@@ -18,6 +18,7 @@
 #define CCS811_H
 
 #include <stdint.h>
+#include "periph/gpio.h"
 #include "periph/i2c.h"
 
 #ifdef __cplusplus