diff --git a/src/classes/CMakeLists.txt b/src/classes/CMakeLists.txt
index 0038b08f..adbe2175 100644
--- a/src/classes/CMakeLists.txt
+++ b/src/classes/CMakeLists.txt
@@ -110,10 +110,6 @@ target_include_directories(
   PUserFcnBase BEFORE PRIVATE $<BUILD_INTERFACE:${MUSRFIT_INC}>
 )
 
-#--- add compile options for optimization -------------------------------------
-target_compile_options(PMusr PUBLIC -O2)
-target_compile_options(PUserFcnBase PUBLIC -O2)
-
 #--- add OpenMP compile options if needed -------------------------------------
 if (OpenMP_FOUND)
   target_compile_options(PMusr PUBLIC ${OpenMP_CXX_FLAGS})
diff --git a/src/external/libCuba/src/common/CMakeLists.txt b/src/external/libCuba/src/common/CMakeLists.txt
index be571a05..40dc6890 100644
--- a/src/external/libCuba/src/common/CMakeLists.txt
+++ b/src/external/libCuba/src/common/CMakeLists.txt
@@ -25,10 +25,3 @@ target_compile_definitions(
   common PRIVATE ${COMP_DEF}
 )
 
-set(COMP_OPT "-O3")
-set(COMP_OPT ${COMP_OPT} "-fomit-frame-pointer")
-set(COMP_OPT ${COMP_OPT} "-ffast-math")
-set(COMP_OPT ${COMP_OPT} "-fPIC")
-target_compile_options(
-  common PRIVATE ${COMP_OPT}
-)
diff --git a/src/external/libCuba/src/cuhre/CMakeLists.txt b/src/external/libCuba/src/cuhre/CMakeLists.txt
index 820e2783..7cd60ff7 100644
--- a/src/external/libCuba/src/cuhre/CMakeLists.txt
+++ b/src/external/libCuba/src/cuhre/CMakeLists.txt
@@ -23,10 +23,3 @@ target_compile_definitions(
   cuhre PRIVATE ${COMP_DEF}
 )
 
-set(COMP_OPT "-O3")
-set(COMP_OPT ${COMP_OPT} "-fomit-frame-pointer")
-set(COMP_OPT ${COMP_OPT} "-ffast-math")
-set(COMP_OPT ${COMP_OPT} "-fPIC")
-target_compile_options(
-  cuhre PRIVATE ${COMP_OPT}
-)
diff --git a/src/external/libCuba/src/divonne/CMakeLists.txt b/src/external/libCuba/src/divonne/CMakeLists.txt
index 18e0d64f..cc609b62 100644
--- a/src/external/libCuba/src/divonne/CMakeLists.txt
+++ b/src/external/libCuba/src/divonne/CMakeLists.txt
@@ -23,10 +23,4 @@ target_compile_definitions(
   divonne PRIVATE ${COMP_DEF}
 )
 
-set(COMP_OPT "-O3")
-set(COMP_OPT ${COMP_OPT} "-fomit-frame-pointer")
-set(COMP_OPT ${COMP_OPT} "-ffast-math")
-set(COMP_OPT ${COMP_OPT} "-fPIC")
-target_compile_options(
-  divonne PRIVATE ${COMP_OPT}
-)
+
diff --git a/src/external/libCuba/src/suave/CMakeLists.txt b/src/external/libCuba/src/suave/CMakeLists.txt
index 7d14defe..0b21ff7a 100644
--- a/src/external/libCuba/src/suave/CMakeLists.txt
+++ b/src/external/libCuba/src/suave/CMakeLists.txt
@@ -23,10 +23,3 @@ target_compile_definitions(
   suave PRIVATE ${COMP_DEF}
 )
 
-set(COMP_OPT "-O3")
-set(COMP_OPT ${COMP_OPT} "-fomit-frame-pointer")
-set(COMP_OPT ${COMP_OPT} "-ffast-math")
-set(COMP_OPT ${COMP_OPT} "-fPIC")
-target_compile_options(
-  suave PRIVATE ${COMP_OPT}
-)
diff --git a/src/external/libCuba/src/vegas/CMakeLists.txt b/src/external/libCuba/src/vegas/CMakeLists.txt
index cc7efddb..d65c5a1e 100644
--- a/src/external/libCuba/src/vegas/CMakeLists.txt
+++ b/src/external/libCuba/src/vegas/CMakeLists.txt
@@ -23,10 +23,3 @@ target_compile_definitions(
   vegas PRIVATE ${COMP_DEF}
 )
 
-set(COMP_OPT "-O3")
-set(COMP_OPT ${COMP_OPT} "-fomit-frame-pointer")
-set(COMP_OPT ${COMP_OPT} "-ffast-math")
-set(COMP_OPT ${COMP_OPT} "-fPIC")
-target_compile_options(
-  vegas PRIVATE ${COMP_OPT}
-)