diff --git a/src/game/tetromino/placing.c b/src/game/tetromino/placing.c
index 28c3075..eb00543 100644
--- a/src/game/tetromino/placing.c
+++ b/src/game/tetromino/placing.c
@@ -68,7 +68,7 @@ static void set_shape_i(row const* const row, shape_id const id, int8_t const po
             continue;
 
         for (int8_t x = 0; x < SHAPE_WIDTH; x++)
-            if (is_set(shape_row, x))
+            if (shape_is_set(shape_row, x))
                 row[y][x + pos_x] = colour;
     }
 }
@@ -85,7 +85,7 @@ static bool shape_intersects(row const* const rows, shape_id const id, int8_t co
         if (shape_row == 0) continue;                        // if the row doesn't contain data; continue
 
         for (int8_t x0 = 0; x0 < SHAPE_WIDTH; x0++) {
-            if (is_set(shape_row, x0) == false) continue; // if the bit isn't set at this index; continue
+            if (shape_is_set(shape_row, x0) == false) continue; // if the bit isn't set at this index; continue
             int8_t const x1 = x + x0;
             int8_t const y1 = y + y0;
 
diff --git a/src/game/tetromino/shapes.h b/src/game/tetromino/shapes.h
index beee4b7..41c9f4b 100644
--- a/src/game/tetromino/shapes.h
+++ b/src/game/tetromino/shapes.h
@@ -31,7 +31,7 @@ static inline shape_row shape_get_row(shape const shape, uint8_t const index) {
     return shape >> (((SHAPE_HEIGHT - 1) - index) * SHAPE_WIDTH) & 0xF;
 }
 
-static inline bool is_set(shape_row const row, uint8_t const index) {
+static inline bool shape_is_set(shape_row const row, uint8_t const index) {
     return (row >> ((SHAPE_WIDTH - 1) - index) & 1) != 0;
 }
 
diff --git a/src/window/renderer.c b/src/window/renderer.c
index ed89bc8..92de3cf 100644
--- a/src/window/renderer.c
+++ b/src/window/renderer.c
@@ -85,7 +85,7 @@ static void draw_shape(SDL_Renderer* const renderer, shape_id const id, int8_t c
             continue;
 
         for (int8_t x = 0; x < SHAPE_WIDTH; x++)
-            if (is_set(shape_row, x))
+            if (shape_is_set(shape_row, x))
                 draw_block(renderer, pos_x + x, pos_y + y);
     }
 }