diff --git a/docs/rh-log.txt b/docs/rh-log.txt
index 5257e777f..50ada4e3d 100644
--- a/docs/rh-log.txt
+++ b/docs/rh-log.txt
@@ -1,4 +1,7 @@
 July 16, 2009
+- Moved the IF_ADDITIVETIME check earlier in APowerup::HandlePickup so
+  that additive time powerups can be activated before the existing
+  power has entered its blink threshold.
 - Added a "BlueMap" for powerup colors.
 - Added a NULL screen check when detaching HUD messages.
 - Added HotWax's A_SetArg.
diff --git a/src/g_shared/a_artifacts.cpp b/src/g_shared/a_artifacts.cpp
index d5dbfd345..8292b199f 100644
--- a/src/g_shared/a_artifacts.cpp
+++ b/src/g_shared/a_artifacts.cpp
@@ -278,19 +278,21 @@ bool APowerup::HandlePickup (AInventory *item)
 			power->ItemFlags |= IF_PICKUPGOOD;
 			return true;
 		}
-		// If it's not blinking yet, you can't replenish the power unless the
-		// powerup is required to be picked up.
-		if (EffectTics > BLINKTHRESHOLD && !(power->ItemFlags & IF_ALWAYSPICKUP))
-		{
-			return true;
-		}
-		// Only increase the EffectTics, not decrease it.
-		// Color also gets transferred only when the new item has an effect.
+		// Color gets transferred if the new item has an effect.
+
+		// Increase the effect's duration.
 		if (power->ItemFlags & IF_ADDITIVETIME) 
 		{
 			EffectTics += power->EffectTics;
 			BlendColor = power->BlendColor;
 		}
+		// If it's not blinking yet, you can't replenish the power unless the
+		// powerup is required to be picked up.
+		else if (EffectTics > BLINKTHRESHOLD && !(power->ItemFlags & IF_ALWAYSPICKUP))
+		{
+			return true;
+		}
+		// Reset the effect duration.
 		else if (power->EffectTics > EffectTics)
 		{
 			EffectTics = power->EffectTics;