diff --git a/gcc/config/rs6000/host-darwin.cc b/gcc/config/rs6000/host-darwin.cc
index 541f7e1c81c..6072a6cddc4 100644
--- a/gcc/config/rs6000/host-darwin.cc
+++ b/gcc/config/rs6000/host-darwin.cc
@@ -58,7 +58,7 @@ extern int sigaltstack(const struct sigaltstack *, struct sigaltstack *);
 static void
 segv_crash_handler (int sig ATTRIBUTE_UNUSED)
 {
-  internal_error ("Segmentation Fault (code)");
+  internal_error ("segmentation fault (code)");
 }
 
 static void
@@ -128,7 +128,7 @@ segv_handler (int sig ATTRIBUTE_UNUSED,
   fprintf (stderr, "[address=%08lx pc=%08x]\n", 
 	   uc->uc_mcontext->MC_FLD(es).MC_FLD(dar),
 	   uc->uc_mcontext->MC_FLD(ss).MC_FLD(srr0));
-  internal_error ("Segmentation Fault");
+  internal_error ("segmentation fault");
   exit (FATAL_EXIT_CODE);
 }
 
diff --git a/gcc/d/decl.cc b/gcc/d/decl.cc
index c7a1e4652f8..5ecc6269780 100644
--- a/gcc/d/decl.cc
+++ b/gcc/d/decl.cc
@@ -1597,7 +1597,7 @@ d_finish_decl (tree decl)
 	{
 	  tree name = DECL_ASSEMBLER_NAME (decl);
 
-	  internal_error ("Mismatch between declaration %qE size (%wd) and "
+	  internal_error ("mismatch between declaration %qE size (%wd) and "
 			  "its initializer size (%wd).",
 			  IDENTIFIER_PRETTY_NAME (name)
 			  ? IDENTIFIER_PRETTY_NAME (name) : name,
diff --git a/gcc/ipa-sra.cc b/gcc/ipa-sra.cc
index 969160f9806..f8a4549c9b0 100644
--- a/gcc/ipa-sra.cc
+++ b/gcc/ipa-sra.cc
@@ -2493,10 +2493,10 @@ verify_splitting_accesses (cgraph_node *node, bool certain_must_exist)
 
       bool certain_access_present = !certain_must_exist;
       if (overlapping_certain_accesses_p (desc, &certain_access_present))
-	internal_error ("Function %qs, parameter %u, has IPA-SRA accesses "
+	internal_error ("function %qs, parameter %u, has IPA-SRA accesses "
 			"which overlap", node->dump_name (), pidx);
       if (!certain_access_present)
-	internal_error ("Function %s, parameter %u, is used but does not "
+	internal_error ("function %qs, parameter %u, is used but does not "
 			"have any certain IPA-SRA access",
 			node->dump_name (), pidx);
     }
diff --git a/gcc/varasm.cc b/gcc/varasm.cc
index 5bc30f0c26e..330ec293711 100644
--- a/gcc/varasm.cc
+++ b/gcc/varasm.cc
@@ -312,7 +312,7 @@ get_section (const char *name, unsigned int flags, tree decl,
   else
     {
       if (not_existing)
-	internal_error ("Section already exists: %qs", name);
+	internal_error ("section already exists: %qs", name);
 
       sect = *slot;
       /* It is fine if one of the sections has SECTION_NOTYPE as long as