diff --git a/celldrawer.cpp b/celldrawer.cpp
index 96e8cd70..fa45617f 100644
--- a/celldrawer.cpp
+++ b/celldrawer.cpp
@@ -2855,7 +2855,7 @@ void celldrawer::draw() {
   
   if(callhandlers(false, hooks_drawcell, c, V)) return;
   
-  if(history::on || inHighQual || WDIM == 3 || sightrange_bonus > gamerange_bonus) checkTide(c);
+  if(history::on || inHighQual || WDIM == 3 || shmup::on || sightrange_bonus > gamerange_bonus || !playermoved) checkTide(c);
   
   if(1) {
   
diff --git a/shmup.cpp b/shmup.cpp
index bac3a124..b2aae678 100644
--- a/shmup.cpp
+++ b/shmup.cpp
@@ -2724,6 +2724,7 @@ EX void turn(int delta) {
         terracotta::check();
         #endif
         heat::processfires();
+        advance_tides();
         if(havewhat&HF_WHIRLPOOL) whirlpool::move();
         if(havewhat&HF_WHIRLWIND) whirlwind::move();
         #if CAP_COMPLEX2