diff --git a/modules/wfc/wave_form_collapse.cpp b/modules/wfc/wave_form_collapse.cpp
index 1399db1bd..b1fceb12d 100644
--- a/modules/wfc/wave_form_collapse.cpp
+++ b/modules/wfc/wave_form_collapse.cpp
@@ -230,13 +230,11 @@ void WaveFormCollapse::propagate() {
 	while (propagating.size() != 0) {
 		// The cell and pattern that has been set to false.
 
-		const PropagatingEntry &e = propagating[propagating.size() - 1];
+		uint32_t y1 = propagating[propagating.size() - 1];
+		uint32_t x1 = propagating[propagating.size() - 2];
+		uint32_t pattern = propagating[propagating.size() - 3];
 
-		uint32_t y1 = e.data[0];
-		uint32_t x1 = e.data[1];
-		uint32_t pattern = e.data[2];
-
-		propagating.resize(propagating.size() - 1);
+		propagating.resize(propagating.size() - 3);
 
 		// We propagate the information in all 4 directions.
 		for (uint32_t direction = 0; direction < 4; direction++) {
diff --git a/modules/wfc/wave_form_collapse.h b/modules/wfc/wave_form_collapse.h
index d47a045cd..d5fee998a 100644
--- a/modules/wfc/wave_form_collapse.h
+++ b/modules/wfc/wave_form_collapse.h
@@ -7,6 +7,7 @@
 #include "array_2d.h"
 #include "array_3d.h"
 #include "core/vector.h"
+#include "core/pool_vector.h"
 
 #include "core/reference.h"
 
@@ -24,22 +25,6 @@ public:
 		Vector<uint32_t> directions[4];
 	};
 
-	struct PropagatingEntry {
-		uint32_t data[3];
-
-		PropagatingEntry() {
-			for (int i = 0; i < 3; ++i) {
-				data[i] = 0;
-			}
-		}
-
-		PropagatingEntry(uint32_t x, uint32_t y, uint32_t z) {
-			data[0] = x;
-			data[1] = y;
-			data[2] = z;
-		}
-	};
-
 	struct CompatibilityEntry {
 		int direction[4];
 
@@ -105,7 +90,9 @@ public:
 		CompatibilityEntry temp;
 		compatible.get(y, x, pattern) = temp;
 
-		propagating.push_back(PropagatingEntry(y, x, pattern));
+		propagating.push_back(pattern);
+		propagating.push_back(x);
+		propagating.push_back(y);
 	}
 
 	constexpr uint32_t get_opposite_direction(uint32_t direction) {
@@ -172,7 +159,7 @@ private:
 
 	// All the tuples (y, x, pattern) that should be propagated.
 	// The tuple should be propagated when wave.get(y, x, pattern) is set to false.
-	Vector<PropagatingEntry> propagating;
+	Vector<uint32_t> propagating;
 
 	// compatible.get(y, x, pattern)[direction] contains the number of patterns
 	// present in the wave that can be placed in the cell next to (y,x) in the