diff --git a/include/sundials/sundials_types.h b/include/sundials/sundials_types.h
index 433c26ecad..50e5a83e69 100644
--- a/include/sundials/sundials_types.h
+++ b/include/sundials/sundials_types.h
@@ -94,8 +94,8 @@ typedef float sunrealtype;
 #define SUN_BIG_REAL      FLT_MAX
 #define SUN_SMALL_REAL    FLT_MIN
 #define SUN_UNIT_ROUNDOFF FLT_EPSILON
-#define SUN_FORMAT_E      "%." SUN_STRING(FLT_DIG) "e"
-#define SUN_FORMAT_G      "%." SUN_STRING(FLT_DIG) "g"
+#define SUN_FORMAT_E      "% ." SUN_STRING(FLT_DIG) "e"
+#define SUN_FORMAT_G      "% ." SUN_STRING(FLT_DIG) "g"
 
 #elif defined(SUNDIALS_DOUBLE_PRECISION)
 
@@ -104,8 +104,8 @@ typedef double sunrealtype;
 #define SUN_BIG_REAL      DBL_MAX
 #define SUN_SMALL_REAL    DBL_MIN
 #define SUN_UNIT_ROUNDOFF DBL_EPSILON
-#define SUN_FORMAT_E      "%." SUN_STRING(DBL_DIG) "e"
-#define SUN_FORMAT_G      "%." SUN_STRING(DBL_DIG) "g"
+#define SUN_FORMAT_E      "% ." SUN_STRING(DBL_DIG) "e"
+#define SUN_FORMAT_G      "% ." SUN_STRING(DBL_DIG) "g"
 
 #elif defined(SUNDIALS_EXTENDED_PRECISION)