diff --git a/tests/clap-first-example/CMakeLists.txt b/tests/clap-first-example/CMakeLists.txt
index 45555803..0399fdac 100644
--- a/tests/clap-first-example/CMakeLists.txt
+++ b/tests/clap-first-example/CMakeLists.txt
@@ -2,7 +2,6 @@ project(clap-first-distortion)
 
 add_library(clap-first-distortion-base STATIC distortion_clap.cpp)
 target_link_libraries(clap-first-distortion-base PUBLIC clap)
-target_compile_options(clap-first-distortion-base PRIVATE _USE_MATH_DEFINES=1)
 
 add_library(${PROJECT_NAME} MODULE
         distortion_clap_entry.cpp
diff --git a/tests/clap-first-example/distortion_clap.cpp b/tests/clap-first-example/distortion_clap.cpp
index 109fd4c2..d640da16 100644
--- a/tests/clap-first-example/distortion_clap.cpp
+++ b/tests/clap-first-example/distortion_clap.cpp
@@ -426,8 +426,8 @@ static clap_process_status c99dist_process(const struct clap_plugin *plugin,
         break;
         case FOLD:
         {
-          tl = sin(2.0 * M_PI * tl);
-          tr = sin(2.0 * M_PI * tr);
+          tl = sin(2.0 * 3.14159265 * tl);
+          tr = sin(2.0 * 3.14159265 * tr);
         }
         break;
       }