diff --git a/src/monster.cpp b/src/monster.cpp
index 77fc67eb381bf..e65d114f0b443 100644
--- a/src/monster.cpp
+++ b/src/monster.cpp
@@ -3167,10 +3167,11 @@ void monster::process_effects()
         add_msg_if_player_sees( *this, m_warning, healing_format_string, name() );
     }
 
-    if( type->regenerates_in_dark ) {
+    if( type->regenerates_in_dark && !g->is_in_sunlight( pos() ) ) {
         const float light = get_map().ambient_light_at( pos() );
         // Magic number 10000 was chosen so that a floodlight prevents regeneration in a range of 20 tiles
-        if( heal( static_cast<int>( 50.0 *  std::exp( - light * light / 10000 ) )  > 0 && one_in( 2 ) ) ) {
+        const float dHP = 50.0 * std::exp( - light * light / 10000 );
+        if( heal( static_cast<int>( dHP ) ) > 0 && one_in( 2 ) ) {
             add_msg_if_player_sees( *this, m_warning, _( "The %s uses the darkness to regenerate." ), name() );
         }
     }