diff --git a/sys/include/phydat.h b/sys/include/phydat.h
index e57a517c5436596b62e0d7a8e42242d1855282f6..d56f968ed187059ea440f23bd1fbb031a49e8356 100644
--- a/sys/include/phydat.h
+++ b/sys/include/phydat.h
@@ -96,6 +96,7 @@ enum {
     UNIT_GS,        /**< gauss */
     UNIT_DBM,       /**< decibel-milliwatts */
     UNIT_COULOMB,   /**< coulomb */
+    UNIT_F,         /**< Farad */
     /* pressure */
     UNIT_BAR,       /**< Beer? */
     UNIT_PA,        /**< Pascal */
diff --git a/sys/phydat/phydat_str.c b/sys/phydat/phydat_str.c
index f450c9aa65938d9944ee41c23b2d2938073cb3e2..ff9e9ad8dcf0a057a768c1d18556d8e48512819a 100644
--- a/sys/phydat/phydat_str.c
+++ b/sys/phydat/phydat_str.c
@@ -103,6 +103,7 @@ const char *phydat_unit_to_str(uint8_t unit)
         case UNIT_CTS:      return "cts";
         case UNIT_COULOMB:  return "C";
         case UNIT_GPM3:     return "g/m^3";
+        case UNIT_F:        return "F";
         default:            return "";
     }
 }