diff --git a/GPU/GPUTracking/CMakeLists.txt b/GPU/GPUTracking/CMakeLists.txt
index 7d0c7e52ce646..ee0ce3d69fc3b 100644
--- a/GPU/GPUTracking/CMakeLists.txt
+++ b/GPU/GPUTracking/CMakeLists.txt
@@ -13,6 +13,10 @@ set(MODULE GPUTracking)
 
 # set(CMAKE_CXX_FLAGS_${CMAKE_BUILD_TYPE} "${CMAKE_CXX_FLAGS_${CMAKE_BUILD_TYPE}} -O0") # to uncomment if needed, tired of typing this...
 
+if(NOT ${GPUCA_NO_FAST_MATH} AND NOT CMAKE_BUILD_TYPE STREQUAL "DEBUG")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -ffast-math")
+endif()
+
 include(cmake/helpers.cmake)
 
 if(ALIGPU_BUILD_TYPE STREQUAL "ALIROOT")