diff --git a/cmake/GNU.cmake b/cmake/GNU.cmake
index 939e25bfa7..a427e8f053 100644
--- a/cmake/GNU.cmake
+++ b/cmake/GNU.cmake
@@ -10,7 +10,10 @@ endif()
 
 if(DEBUG)
     add_definitions(-DDEBUG)
-    set(CMAKE_Fortran_FLAGS_DEBUG "${CMAKE_Fortran_FLAGS_DEBUG} -O0 -fno-unsafe-math-optimizations -frounding-math -fsignaling-nans -ffpe-trap=invalid,zero,overflow -fbounds-check -mcmodel=medium")
+    set(CMAKE_Fortran_FLAGS_DEBUG "${CMAKE_Fortran_FLAGS_DEBUG} -O0 -fno-unsafe-math-optimizations -frounding-math -fsignaling-nans -ffpe-trap=invalid,zero,overflow -fbounds-check")
+    if(CMAKE_Platform STREQUAL "hercules.gnu")
+      set(CMAKE_Fortran_FLAGS_DEBUG "${CMAKE_Fortran_FLAGS_DEBUG} -mcmodel=medium")
+    endif()
     set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -O0")
 else()
     set(CMAKE_Fortran_FLAGS_RELEASE "-O2")