diff --git a/ChangeLog b/ChangeLog
index 149463d9d..479b4fc09 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2012-02-29  Vladimir Serbinenko  <phcoder@gmail.com>
+
+	* include/grub/symbol.h (EXT_C) [!ASM_FILE]: Redefine with strings.
+	* grub-core/lib/i386/backtrace.c (grub_backtrace): Use EXT_C.
+
 2012-02-29  Vladimir Serbinenko  <phcoder@gmail.com>
 
 	* grub-core/gdb/i386/machdep.S: Use VARIABLE and EXT_C instead of
diff --git a/grub-core/lib/i386/backtrace.c b/grub-core/lib/i386/backtrace.c
index c673ea45e..7a7796a12 100644
--- a/grub-core/lib/i386/backtrace.c
+++ b/grub-core/lib/i386/backtrace.c
@@ -57,10 +57,10 @@ grub_backtrace (void)
 {
 #ifdef __x86_64__
   asm volatile ("movq %rbp, %rdi\n"
-		"call grub_backtrace_pointer");
+		"call " EXT_C("grub_backtrace_pointer"));
 #else
   asm volatile ("movl %ebp, %eax\n"
-		"call grub_backtrace_pointer");
+		"call " EXT_C("grub_backtrace_pointer"));
 #endif
 }
 
diff --git a/include/grub/symbol.h b/include/grub/symbol.h
index ddbb9b53f..dcf5ca413 100644
--- a/include/grub/symbol.h
+++ b/include/grub/symbol.h
@@ -26,9 +26,14 @@
 
 /* Add an underscore to a C symbol in assembler code if needed. */
 #ifndef GRUB_UTIL
+
 #if HAVE_ASM_USCORE
+#ifdef ASM_FILE
 # define EXT_C(sym)	_ ## sym
 #else
+# define EXT_C(sym)	"_" sym
+#endif
+#else
 # define EXT_C(sym)	sym
 #endif