diff --git a/ggml/src/ggml-cuda/common.cuh b/ggml/src/ggml-cuda/common.cuh
index 4a99a17097..a328a2a82b 100644
--- a/ggml/src/ggml-cuda/common.cuh
+++ b/ggml/src/ggml-cuda/common.cuh
@@ -231,13 +231,13 @@ template<typename Kernel, typename... Args>
 static __inline__ void ggml_cuda_kernel_launch(Kernel kernel, const ggml_cuda_kernel_launch_params & launch_params, Args&&... args) {
 #if defined(GGML_CUDA_USE_PDL)
 
-    // PDL is off by default. To enable, set GGML_CUDA_ENABLE_PDL=1
-    static const bool enable_pdl = []() {
-        const char * env = getenv("GGML_CUDA_ENABLE_PDL");
+    // PDL is on by default. To disable, set GGML_CUDA_DISABLE_PDL=1
+    static const bool disable_pdl = []() {
+        const char * env = getenv("GGML_CUDA_DISABLE_PDL");
         return env != nullptr && std::atoi(env) != 0;
     }();
 
-    if (enable_pdl) {
+    if (!disable_pdl) {
         auto pdl_cfg = ggml_cuda_pdl_config(launch_params);
         CUDA_CHECK(cudaLaunchKernelEx(&pdl_cfg.cfg, kernel, std::forward<Args>(args)... ));
         return;