diff --git a/CMakeLists.txt b/CMakeLists.txt
index 05f03a6bc..1450b1d23 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -956,7 +956,7 @@ if (Fortran_COMPILER_NAME MATCHES "gfortran.*")
   endif (CMAKE_OSX_SYSROOT)
 
   set (CMAKE_Fortran_FLAGS_RELEASE "${CMAKE_Fortran_FLAGS_RELEASE} -fbounds-check -funroll-all-loops -fno-f2c ${General_FFLAGS}")
-  set (CMAKE_Fortran_FLAGS_DEBUG   "${CMAKE_Fortran_FLAGS_DEBUG} -fbounds-check -fno-f2c -ffpe-trap=denormal,invalid,zero,overflow ${General_FFLAGS}")
+  set (CMAKE_Fortran_FLAGS_DEBUG   "${CMAKE_Fortran_FLAGS_DEBUG} -g -fbacktrace -fbounds-check -fno-f2c -ffpe-trap=denormal,invalid,zero,overflow,underflow ${General_FFLAGS}")
 elseif (Fortran_COMPILER_NAME MATCHES "ifort.*")
   # ifort (untested)
   set (CMAKE_Fortran_FLAGS_RELEASE "${CMAKE_Fortran_FLAGS_RELEASE} -f77rtl ${General_FFLAGS}")