diff --git a/test/testgles.c b/test/testgles.c
index cb989f4..745cf89 100644
--- a/test/testgles.c
+++ b/test/testgles.c
@@ -173,7 +173,7 @@
         quit(2);
     }
 
-    context = (SDL_GLContext *)SDL_calloc(state->num_windows, sizeof(context));
+    context = (SDL_GLContext *)SDL_calloc(state->num_windows, sizeof(*context));
     if (context == NULL) {
         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Out of memory!\n");
         quit(2);
diff --git a/test/testgles2.c b/test/testgles2.c
index 721c24b..903f7a8 100644
--- a/test/testgles2.c
+++ b/test/testgles2.c
@@ -614,7 +614,7 @@
         return 0;
     }
 
-    context = (SDL_GLContext *)SDL_calloc(state->num_windows, sizeof(context));
+    context = (SDL_GLContext *)SDL_calloc(state->num_windows, sizeof(*context));
     if (context == NULL) {
         SDL_Log("Out of memory!\n");
         quit(2);
diff --git a/test/testgles2_sdf.c b/test/testgles2_sdf.c
index 064b6bc..e9e79d6 100644
--- a/test/testgles2_sdf.c
+++ b/test/testgles2_sdf.c
@@ -522,7 +522,7 @@
         return 0;
     }
 
-    context = (SDL_GLContext *)SDL_calloc(state->num_windows, sizeof(context));
+    context = (SDL_GLContext *)SDL_calloc(state->num_windows, sizeof(*context));
     if (context == NULL) {
         SDL_Log("Out of memory!\n");
         quit(2);