diff --git a/src/lib/libegl.js b/src/lib/libEGL.js
similarity index 100%
rename from src/lib/libegl.js
rename to src/lib/libEGL.js
diff --git a/src/lib/libglew.js b/src/lib/libGLEW.js
similarity index 100%
rename from src/lib/libglew.js
rename to src/lib/libGLEW.js
diff --git a/src/lib/libsdl.js b/src/lib/libSDL.js
similarity index 100%
rename from src/lib/libsdl.js
rename to src/lib/libSDL.js
diff --git a/src/lib/libxlib.js b/src/lib/libX11.js
similarity index 100%
rename from src/lib/libxlib.js
rename to src/lib/libX11.js
diff --git a/src/modules.mjs b/src/modules.mjs
index 826f7ac704e0d..d9bb975a567f5 100644
--- a/src/modules.mjs
+++ b/src/modules.mjs
@@ -134,25 +134,25 @@ function calculateLibraries() {
       'libhtml5_webgl.js',
       'libopenal.js',
       'libglut.js',
-      'libxlib.js',
-      'libegl.js',
+      'libXLIB.js',
+      'libEGL.js',
       'libuuid.js',
-      'libglew.js',
+      'libGLEW.js',
       'libidbstore.js',
       'libasync.js',
     );
     if (USE_SDL != 2) {
-      libraries.push('libsdl.js');
+      libraries.push('libSDL.js');
     }
   } else {
     if (ASYNCIFY) {
       libraries.push('libasync.js');
     }
     if (USE_SDL == 1) {
-      libraries.push('libsdl.js');
+      libraries.push('libSDL.js');
     }
     if (USE_SDL == 2) {
-      libraries.push('libegl.js', 'libwebgl.js', 'libhtml5_webgl.js');
+      libraries.push('libEGL.js', 'libwebgl.js', 'libhtml5_webgl.js');
     }
   }
 
diff --git a/tools/link.py b/tools/link.py
index be78dee2b13e0..1e49e08c930e9 100644
--- a/tools/link.py
+++ b/tools/link.py
@@ -2770,19 +2770,19 @@ def map_to_js_libs(library_name):
   # Some native libraries are implemented in Emscripten as system side JS libraries
   library_map = {
     'embind': ['libembind.js', 'libemval.js'],
-    'EGL': ['libegl.js'],
+    'EGL': ['libEGL.js'],
     'GL': ['libwebgl.js', 'libhtml5_webgl.js'],
     'webgl.js': ['libwebgl.js', 'libhtml5_webgl.js'],
     'GLESv2': ['libwebgl.js'],
     # N.b. there is no GLESv3 to link to (note [f] in https://www.khronos.org/registry/implementers_guide.html)
-    'GLEW': ['libglew.js'],
+    'GLEW': ['libGLEW.js'],
     'glfw': ['libglfw.js'],
     'glfw3': ['libglfw.js'],
     'GLU': [],
     'glut': ['libglut.js'],
     'openal': ['libopenal.js'],
-    'X11': ['libxlib.js'],
-    'SDL': ['libsdl.js'],
+    'X11': ['libX11.js'],
+    'SDL': ['libSDL.js'],
     'uuid': ['libuuid.js'],
     'fetch': ['libfetch.js'],
     'websocket': ['libwebsocket.js'],