diff --git a/src/alien.c b/src/alien.c
index 42ca99f..e3723bf 100644
--- a/src/alien.c
+++ b/src/alien.c
@@ -2212,9 +2212,9 @@ void alien_hurt(Object *alien, Object *attacker, int damage, int ion)
 		if (game.area == MISN_ELAMALE)
 		{
 			if (game.difficulty == DIFFICULTY_ORIGINAL)
-				stage1_shield = alien->maxShield * 3 / 8;
+				stage1_shield = KLINE_SHIELD_MEDIUM;
 			else
-				stage1_shield = alien->maxShield / 4;
+				stage1_shield = KLINE_SHIELD_SMALL;
 
 			if ((alien->shield <= alien->maxShield - stage1_shield)
 				&& !(alien->flags & FL_LEAVESECTOR))
@@ -2228,9 +2228,9 @@ void alien_hurt(Object *alien, Object *attacker, int damage, int ion)
 		else if (game.area == MISN_EARTH)
 		{
 			if (game.difficulty == DIFFICULTY_ORIGINAL)
-				stage1_shield = alien->maxShield / 4;
+				stage1_shield = KLINE_SHIELD_SMALL;
 			else
-				stage1_shield = alien->maxShield * 3 / 8;
+				stage1_shield = KLINE_SHIELD_MEDIUM;
 
 			if ((alien->shield <= alien->maxShield - stage1_shield)
 				&& !(alien->flags & FL_LEAVESECTOR))
@@ -2243,9 +2243,9 @@ void alien_hurt(Object *alien, Object *attacker, int damage, int ion)
 		}
 		else if (game.area == MISN_VENUS)
 		{
-			stage1_shield = alien->maxShield * 3 / 4;
-			stage2_shield = alien->maxShield / 2;
-			stage3_shield = alien->maxShield / 4;
+			stage1_shield = KLINE_STAGE1_SHIELD;
+			stage2_shield = KLINE_STAGE2_SHIELD;
+			stage3_shield = KLINE_STAGE3_SHIELD;
 
 			if (alien->shield + damage > stage1_shield
 					&& alien->shield <= stage1_shield)
@@ -2271,7 +2271,7 @@ void alien_hurt(Object *alien, Object *attacker, int damage, int ion)
 		}
 		else
 		{
-			stage1_shield = alien->maxShield / 20;
+			stage1_shield = KLINE_SHIELD_TINY;
 
 			if ((alien->shield <= alien->maxShield - stage1_shield)
 				&& !(alien->flags & FL_LEAVESECTOR))
diff --git a/src/defs.h b/src/defs.h
index cc3df57..dd81e02 100644
--- a/src/defs.h
+++ b/src/defs.h
@@ -107,6 +107,13 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define JS_DEADZONE 0.05
 #define JS_MAX (32767 - JS_DEADZONE*32767)
 
+#define KLINE_STAGE1_SHIELD (aliens[ALIEN_KLINE].maxShield * 3 / 4)
+#define KLINE_STAGE2_SHIELD (aliens[ALIEN_KLINE].maxShield / 2)
+#define KLINE_STAGE3_SHIELD (aliens[ALIEN_KLINE].maxShield / 4)
+#define KLINE_SHIELD_TINY (aliens[ALIEN_KLINE].maxShield / 20)
+#define KLINE_SHIELD_SMALL (aliens[ALIEN_KLINE].maxShield / 4)
+#define KLINE_SHIELD_MEDIUM (aliens[ALIEN_KLINE].maxShield * 3 / 8)
+
 // Radio life/speed
 #define RADIO_LIFE_INSTANT  60
 #define RADIO_LIFE_FAST     120
diff --git a/src/game.c b/src/game.c
index 6ad2486..e15b73b 100644
--- a/src/game.c
+++ b/src/game.c
@@ -1913,6 +1913,7 @@ static void game_doHud()
 	int tTextIndex;
 	char text[STRMAX_SHORT];
 	float nbars; // A float for the sake of float division
+	float min_shield, max_shield;
 	float shield_pct;
 	int i;
 	int c;
@@ -2144,8 +2145,62 @@ static void game_doHud()
 			bar.x = screen->w * 11 / 16 + gfx_textSprites[tTextIndex].image->w + 10;
 			bar.y = screen->h - 50;
 			nbars = 85.;
-			shield_pct = ((float)aliens[engine.targetIndex].shield
-				/ (float)aliens[engine.targetIndex].maxShield);
+			if (engine.targetIndex == ALIEN_KLINE
+					&& game.difficulty == DIFFICULTY_ORIGINAL)
+			{
+				if (game.area == MISN_ELAMALE)
+				{
+					max_shield = aliens[engine.targetIndex].maxShield;
+					min_shield = max_shield - KLINE_SHIELD_MEDIUM;
+				}
+				else if (game.area == MISN_EARTH)
+				{
+					max_shield = aliens[engine.targetIndex].maxShield;
+					min_shield = max_shield - KLINE_SHIELD_SMALL;
+				}
+				else if (game.area == MISN_VENUS)
+				{
+					if (aliens[ALIEN_KLINE].shield > KLINE_STAGE1_SHIELD)
+					{
+						max_shield = aliens[engine.targetIndex].maxShield;
+						min_shield = KLINE_STAGE1_SHIELD;
+					}
+					else if (aliens[ALIEN_KLINE].shield > KLINE_STAGE2_SHIELD)
+					{
+						max_shield = KLINE_STAGE1_SHIELD;
+						min_shield = KLINE_STAGE2_SHIELD;
+					}
+					else if (aliens[ALIEN_KLINE].shield > KLINE_STAGE3_SHIELD)
+					{
+						max_shield = KLINE_STAGE2_SHIELD;
+						min_shield = KLINE_STAGE3_SHIELD;
+					}
+					else
+					{
+						max_shield = KLINE_STAGE3_SHIELD;
+						min_shield = 0;
+					}
+				}
+				else
+				{
+					max_shield = aliens[engine.targetIndex].maxShield;
+					min_shield = max_shield - KLINE_SHIELD_TINY;
+				}
+
+				if (min_shield > 0)
+					shield_pct = (
+						MAX((float)aliens[engine.targetIndex].shield - min_shield, 1.)
+							/ (max_shield-min_shield));
+				else
+					shield_pct = (
+						((float)aliens[engine.targetIndex].shield - min_shield)
+							/ (max_shield-min_shield));
+			}
+			else
+			{
+				shield_pct = ((float)aliens[engine.targetIndex].shield
+					/ (float)aliens[engine.targetIndex].maxShield);
+			}
 
 			for (i = 0 ; i < nbars ; i++)
 			{