diff --git a/libkwineffects/kwineffects.h b/libkwineffects/kwineffects.h
--- a/libkwineffects/kwineffects.h
+++ b/libkwineffects/kwineffects.h
@@ -188,7 +188,7 @@
 
 #define KWIN_EFFECT_API_MAKE_VERSION( major, minor ) (( major ) << 8 | ( minor ))
 #define KWIN_EFFECT_API_VERSION_MAJOR 0
-#define KWIN_EFFECT_API_VERSION_MINOR 229
+#define KWIN_EFFECT_API_VERSION_MINOR 230
 #define KWIN_EFFECT_API_VERSION KWIN_EFFECT_API_MAKE_VERSION( \
         KWIN_EFFECT_API_VERSION_MAJOR, KWIN_EFFECT_API_VERSION_MINOR )
 
diff --git a/libkwineffects/kwinglutils.h b/libkwineffects/kwinglutils.h
--- a/libkwineffects/kwinglutils.h
+++ b/libkwineffects/kwinglutils.h
@@ -221,13 +221,6 @@
      * @return @c true if a shader is bound, @c false otherwise
      */
     bool isShaderBound() const;
-    /**
-     * Is @c true if the environment variable KWIN_GL_DEBUG is set to 1.
-     * In that case shaders are compiled with KWIN_SHADER_DEBUG defined.
-     * @returns @c true if shaders are compiled with debug information
-     * @since 4.8
-     */
-    bool isShaderDebug() const;
 
     /**
      * Pushes the current shader onto the stack and binds a shader
@@ -332,7 +325,6 @@
 
     QStack<GLShader*> m_boundShaders;
     QHash<ShaderTraits, GLShader *> m_shaderHash;
-    bool m_debug;
     QString m_resourcePath;
     static ShaderManager *s_shaderManager;
 };
diff --git a/libkwineffects/kwinglutils.cpp b/libkwineffects/kwinglutils.cpp
--- a/libkwineffects/kwinglutils.cpp
+++ b/libkwineffects/kwinglutils.cpp
@@ -226,9 +226,6 @@
     if (GLPlatform::instance()->isGLES() && GLPlatform::instance()->glslVersion() < kVersionNumber(3, 0)) {
         ba.append("precision highp float;\n");
     }
-    if (ShaderManager::instance()->isShaderDebug()) {
-        ba.append("#define KWIN_SHADER_DEBUG 1\n");
-    }
     ba.append(source);
     if (GLPlatform::instance()->isGLES() && GLPlatform::instance()->glslVersion() >= kVersionNumber(3, 0)) {
         ba.replace("#version 140", "#version 300 es\n\nprecision highp float;\n");
@@ -557,8 +554,6 @@
 
 ShaderManager::ShaderManager()
 {
-    m_debug = qstrcmp(qgetenv("KWIN_GL_DEBUG"), "1") == 0;
-
     const qint64 coreVersionNumber = GLPlatform::instance()->isGLES() ? kVersionNumber(3, 0) : kVersionNumber(1, 40);
     if (GLPlatform::instance()->glslVersion() >= coreVersionNumber) {
         m_resourcePath = QStringLiteral(":/effect-shaders-1.40/");
@@ -995,11 +990,6 @@
     return !m_boundShaders.isEmpty();
 }
 
-bool ShaderManager::isShaderDebug() const
-{
-    return m_debug;
-}
-
 GLShader *ShaderManager::pushShader(ShaderTraits traits)
 {
     GLShader *shader = this->shader(traits);