diff --git a/libs/gfx/CMakeLists.txt b/libs/gfx/CMakeLists.txt
index 887a3fd9..fe9e6105 100644
--- a/libs/gfx/CMakeLists.txt
+++ b/libs/gfx/CMakeLists.txt
@@ -1,7 +1,7 @@
 find_file(KHR_PLATFORM_FILE KHR/khrplatform.h)
 
 file(GLOB_RECURSE PSEMEK_GFX_HEADERS RELATIVE "${CMAKE_CURRENT_SOURCE_DIR}" "include/*.hpp" "include/*.h")
-file(GLOB_RECURSE PSEMEK_GFX_SOURCES RELATIVE "${CMAKE_CURRENT_SOURCE_DIR}" "source/*.cpp" "source/*.c")
+file(GLOB_RECURSE PSEMEK_GFX_SOURCES RELATIVE "${CMAKE_CURRENT_SOURCE_DIR}" "source/*.cpp")
 
 psemek_add_library(psemek-gfx ${PSEMEK_GFX_HEADERS} ${PSEMEK_GFX_SOURCES} "${CMAKE_CURRENT_SOURCE_DIR}/api/${PSEMEK_GL_API}/source/gl.cpp")
 target_include_directories(psemek-gfx PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/include" "${CMAKE_CURRENT_SOURCE_DIR}/api/${PSEMEK_GL_API}/include")
diff --git a/libs/gfx/source/detail/stb_image.c b/libs/gfx/source/detail/stb_image.cpp
similarity index 76%
rename from libs/gfx/source/detail/stb_image.c
rename to libs/gfx/source/detail/stb_image.cpp
index 28af4707..b6d8b812 100644
--- a/libs/gfx/source/detail/stb_image.c
+++ b/libs/gfx/source/detail/stb_image.cpp
@@ -1,6 +1,9 @@
 #define STB_IMAGE_IMPLEMENTATION
 #define STBI_FAILURE_USERMSG
 
+#include <psemek/util/assert.hpp>
+#define STBI_ASSERT(x) assert(x)
+
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wunused-but-set-variable"
 #include <psemek/gfx/detail/stb_image.h>