diff --git a/rtengine/imagedata.cc b/rtengine/imagedata.cc
index de5988d9b..0afe612b9 100644
--- a/rtengine/imagedata.cc
+++ b/rtengine/imagedata.cc
@@ -566,7 +566,7 @@ std::string ImageMetaData::shutterToString (double shutter)
 
     char buffer[256];
 
-    if (shutter > 0.0 && shutter < 0.9) {
+    if (shutter > 0.0 && shutter <= 0.5) {
         sprintf (buffer, "1/%0.0f", 1.0 / shutter);
     } else {
         sprintf (buffer, "%0.1f", shutter);
diff --git a/rtexif/stdattribs.cc b/rtexif/stdattribs.cc
index ed8f97819..4dcea5622 100644
--- a/rtexif/stdattribs.cc
+++ b/rtexif/stdattribs.cc
@@ -389,7 +389,7 @@ public:
         char buffer[32];
         double d = pow (2.0, -t->toDouble());
 
-        if (d > 0.0 && d < 0.9) {
+        if (d > 0.0 && d <= 0.5) {
             sprintf (buffer, "1/%.0f", 1.0 / d);
         } else {
             sprintf (buffer, "%.1f", d);
@@ -409,7 +409,7 @@ public:
         char buffer[32];
         double d = t->toDouble();
 
-        if (d > 0.0 && d < 0.9) {
+        if (d > 0.0 && d <= 0.5) {
             sprintf (buffer, "1/%.0f", 1.0 / d);
         } else {
             sprintf (buffer, "%.1f", d);