diff --git a/configure/os/CONFIG_SITE.Common.linux-x86 b/configure/os/CONFIG_SITE.Common.linux-x86
index 1be38cb78..9e7262cce 100644
--- a/configure/os/CONFIG_SITE.Common.linux-x86
+++ b/configure/os/CONFIG_SITE.Common.linux-x86
@@ -38,3 +38,4 @@ COMMANDLINE_LIBRARY = READLINE
 # This does cost disk space, but not memory as debug symbols are not
 # loaded into RAM when the binary is loaded.
 OPT_CFLAGS_YES += -g
+OPT_CXXFLAGS_YES += -g
diff --git a/configure/os/CONFIG_SITE.Common.linux-x86_64 b/configure/os/CONFIG_SITE.Common.linux-x86_64
index e48241ab0..ddc90d570 100644
--- a/configure/os/CONFIG_SITE.Common.linux-x86_64
+++ b/configure/os/CONFIG_SITE.Common.linux-x86_64
@@ -38,3 +38,4 @@ COMMANDLINE_LIBRARY = READLINE
 # This does cost disk space, but not memory as debug symbols are not
 # loaded into RAM when the binary is loaded.
 OPT_CFLAGS_YES += -g
+OPT_CXXFLAGS_YES += -g