diff --git a/source/build/include/build.h b/source/build/include/build.h
index a95b4b5f9..f6089a0f6 100644
--- a/source/build/include/build.h
+++ b/source/build/include/build.h
@@ -21,7 +21,6 @@ static_assert('\xff' == 255, "Char must be unsigned!");
 # error Visual Studio 2013 is the minimum supported version.
 #endif
 
-#include "collections.h"
 #include "compat.h"
 #include "palette.h"
 #include "pragmas.h"
diff --git a/source/build/include/collections.h b/source/build/include/collections.h
deleted file mode 100644
index 7aba68cf9..000000000
--- a/source/build/include/collections.h
+++ /dev/null
@@ -1,69 +0,0 @@
-
-#pragma once
-
-#ifndef collections_h_
-#define collections_h_
-
-#include "compat.h"
-
-#ifdef HAVE_CXX11_HEADERS
-
-// GrowArray - heap-allocated storage that can expand at runtime
-// requirements: type must work properly with realloc -- otherwise, use std::vector
-
-template <typename T, size_t increment_ = 1, typename = enable_if_t<std::is_pod<T>::value>, typename = enable_if_t<(increment_ > 0)>>
-struct GrowArray
-{
-    FORCE_INLINE T * begin() const { return data_; }
-    FORCE_INLINE T * end() const { return data_ + size_; }
-
-    FORCE_INLINE size_t size() const { return size_; }
-
-    FORCE_INLINE T& operator[](size_t index) { return data_[index]; }
-    FORCE_INLINE const T& operator[](size_t index) const { return data_[index]; }
-
-    FORCE_INLINE T& first() { return data_[0]; }
-    FORCE_INLINE const T& first() const { return data_[0]; }
-
-    FORCE_INLINE T& last() { return data_[size_-1]; }
-    FORCE_INLINE const T& last() const { return data_[size_-1]; }
-
-    void append(T item)
-    {
-        if (size_ == capacity_)
-            reallocate(capacity_ + increment_);
-        data_[size_++] = item;
-    }
-
-    void removeLast()
-    {
-        --size_;
-    }
-
-    void vacuum()
-    {
-        if (size_ < capacity_)
-            reallocate(size_);
-    }
-
-    void clear()
-    {
-        size_ = 0;
-        capacity_ = 0;
-        free(data_);
-        data_ = nullptr;
-    }
-
-protected:
-    void reallocate(size_t newcapacity)
-    {
-        data_ = (T *)Xrealloc(data_, newcapacity * sizeof(T));
-        capacity_ = newcapacity;
-    }
-    T * data_ = nullptr;
-    size_t size_ = 0, capacity_ = 0;
-};
-
-#endif
-
-#endif // collections_h_
diff --git a/source/duke3d/src/common_game.h b/source/duke3d/src/common_game.h
index 0416c554c..709a137ec 100644
--- a/source/duke3d/src/common_game.h
+++ b/source/duke3d/src/common_game.h
@@ -7,7 +7,6 @@
 #ifndef EDUKE32_COMMON_GAME_H_
 #define EDUKE32_COMMON_GAME_H_
 
-#include "collections.h"
 #include "gamecontrol.h"
 
 BEGIN_DUKE_NS
diff --git a/source/rr/src/common_game.h b/source/rr/src/common_game.h
index f39dae046..2e3c6e9c5 100644
--- a/source/rr/src/common_game.h
+++ b/source/rr/src/common_game.h
@@ -7,7 +7,6 @@
 #ifndef EDUKE32_COMMON_GAME_H_
 #define EDUKE32_COMMON_GAME_H_
 
-#include "collections.h"
 #include "gamecontrol.h"
 
 BEGIN_RR_NS