diff --git a/src/util/dos_assert.h b/src/util/dos_assert.h
index 679acf2..8b5a03d 100644
--- a/src/util/dos_assert.h
+++ b/src/util/dos_assert.h
@@ -49,6 +49,6 @@ static void dos_detected( const char *expression, const char *file, int line, co
 #define dos_assert(expr)						\
   ((expr)								\
    ? (void)0								\
-   : dos_detected (__STRING(expr), __FILE__, __LINE__, __PRETTY_FUNCTION__ ))
+   : dos_detected (#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__ ))
 
 #endif
diff --git a/src/util/fatal_assert.h b/src/util/fatal_assert.h
index 4f993ac..99517f6 100644
--- a/src/util/fatal_assert.h
+++ b/src/util/fatal_assert.h
@@ -46,6 +46,6 @@ static void fatal_error( const char *expression, const char *file, int line, con
 #define fatal_assert(expr)						\
   ((expr)								\
    ? (void)0								\
-   : fatal_error (__STRING(expr), __FILE__, __LINE__, __PRETTY_FUNCTION__ ))
+   : fatal_error (#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__ ))
 
 #endif