diff --git a/cmake/FindASan.cmake b/cmake/FindASan.cmake
index fa07674..c9c55e6 100644
--- a/cmake/FindASan.cmake
+++ b/cmake/FindASan.cmake
@@ -26,10 +26,10 @@ option(SANITIZE_ADDRESS "Enable AddressSanitizer for sanitized targets." Off)
 
 set(FLAG_CANDIDATES
     # Clang 3.2+ use this version
-    "-g -O1 -fsanitize=address"
+    "-g -fsanitize=address"
 
     # Older deprecated flag for ASan
-    "-g -O1 -faddress-sanitizer"
+    "-g -faddress-sanitizer"
 )
 
 
diff --git a/cmake/FindMSan.cmake b/cmake/FindMSan.cmake
index bdc2c2c..3b0a4ad 100644
--- a/cmake/FindMSan.cmake
+++ b/cmake/FindMSan.cmake
@@ -25,7 +25,7 @@
 option(SANITIZE_MEMORY "Enable MemorySanitizer for sanitized targets." Off)
 
 set(FLAG_CANDIDATES
-    "-g -O1 -fsanitize=memory"
+    "-g -fsanitize=memory"
 )
 
 
diff --git a/cmake/FindTSan.cmake b/cmake/FindTSan.cmake
index 81e07b0..0e80f29 100644
--- a/cmake/FindTSan.cmake
+++ b/cmake/FindTSan.cmake
@@ -25,7 +25,7 @@
 option(SANITIZE_THREAD "Enable ThreadSanitizer for sanitized targets." Off)
 
 set(FLAG_CANDIDATES
-    "-g -O1 -fsanitize=thread"
+    "-g -fsanitize=thread"
 )
 
 
diff --git a/cmake/FindUBSan.cmake b/cmake/FindUBSan.cmake
index 5ae0b54..6948674 100644
--- a/cmake/FindUBSan.cmake
+++ b/cmake/FindUBSan.cmake
@@ -26,7 +26,7 @@ option(SANITIZE_UNDEFINED
     "Enable UndefinedBehaviorSanitizer for sanitized targets." Off)
 
 set(FLAG_CANDIDATES
-    "-g -O1 -fsanitize=undefined"
+    "-g -fsanitize=undefined"
 )