diff --git a/Modules/Compiler/XL-ASM.cmake b/Modules/Compiler/XL-ASM.cmake
index 07507f9be..212179e34 100644
--- a/Modules/Compiler/XL-ASM.cmake
+++ b/Modules/Compiler/XL-ASM.cmake
@@ -1,9 +1,8 @@
 set(CMAKE_ASM_VERBOSE_FLAG "-V")
 
 # -qthreaded     = Ensures that all optimizations will be thread-safe
-# -qalias=noansi = Turns off type-based aliasing completely (safer optimizer)
 # -qhalt=e       = Halt on error messages (rather than just severe errors)
-set(CMAKE_ASM_FLAGS_INIT "-qthreaded -qalias=noansi -qhalt=e -qsourcetype=assembler")
+set(CMAKE_ASM_FLAGS_INIT "-qthreaded -qhalt=e -qsourcetype=assembler")
 
 set(CMAKE_ASM_FLAGS_DEBUG_INIT "-g")
 set(CMAKE_ASM_FLAGS_RELEASE_INIT "-O -DNDEBUG")
diff --git a/Modules/Compiler/XL-C.cmake b/Modules/Compiler/XL-C.cmake
index 09a55291e..97dd01789 100644
--- a/Modules/Compiler/XL-C.cmake
+++ b/Modules/Compiler/XL-C.cmake
@@ -4,6 +4,5 @@ set(CMAKE_C_FLAGS_RELEASE_INIT "${CMAKE_C_FLAGS_RELEASE_INIT} -DNDEBUG")
 set(CMAKE_C_FLAGS_MINSIZEREL_INIT "${CMAKE_C_FLAGS_MINSIZEREL_INIT} -DNDEBUG")
 
 # -qthreaded     = Ensures that all optimizations will be thread-safe
-# -qalias=noansi = Turns off type-based aliasing completely (safer optimizer)
 # -qhalt=e       = Halt on error messages (rather than just severe errors)
-set(CMAKE_C_FLAGS_INIT "-qthreaded -qalias=noansi -qhalt=e")
+set(CMAKE_C_FLAGS_INIT "-qthreaded -qhalt=e")