diff --git a/source/blender/blenkernel/intern/unit.c b/source/blender/blenkernel/intern/unit.c
index b89e576a562..a9792bc44fa 100644
--- a/source/blender/blenkernel/intern/unit.c
+++ b/source/blender/blenkernel/intern/unit.c
@@ -136,7 +136,7 @@ static struct bUnitDef buImperialLenDef[] = {
 	{"yard", "yards",		"yd", NULL, "Yards",	UN_SC_YD, 0.0,	B_UNIT_DEF_NONE},
 	{"foot", "feet",		"'", "ft", "Feet",		UN_SC_FT, 0.0,	B_UNIT_DEF_NONE}, /* base unit */
 	{"inch", "inches",		"\"", "in", "Inches",	UN_SC_IN, 0.0,	B_UNIT_DEF_NONE},
-	{"thou", "thous",		"mil", NULL, "Thous",	UN_SC_MIL, 0.0,	B_UNIT_DEF_NONE},
+	{"thou", "thou",		"thou", "mil", "Thou",	UN_SC_MIL, 0.0,	B_UNIT_DEF_NONE}, /* plural for thou has no 's' */
 	{NULL, NULL, NULL, NULL, NULL, 0.0, 0.0}
 };
 static struct bUnitCollection buImperialLenCollecton = {buImperialLenDef, 4, 0, sizeof(buImperialLenDef)/sizeof(bUnitDef)};