diff --git a/dive.h b/dive.h
index e4c4e354c..c56d569ad 100644
--- a/dive.h
+++ b/dive.h
@@ -20,6 +20,8 @@
     (void) (&_max1 == &_max2);      \
     _max1 > _max2 ? _max1 : _max2; })
 
+#define IS_FP_SAME(_a,_b) (abs((_a) - (_b)) < 0.000001)
+
 #include <libxml/tree.h>
 #include <libxslt/transform.h>
 
diff --git a/dives/test9a.xml b/dives/test9a.xml
new file mode 100644
index 000000000..ac9fa8582
--- /dev/null
+++ b/dives/test9a.xml
@@ -0,0 +1,42 @@
+<dives>
+<program name='subsurface' version='1'></program>
+<dive number='9' date='2011-01-01' time='17:00:00' duration='30:00 min'>
+  <depth max='30.0 m' mean='15.0 m' />
+  <temperature air='27.0 C' water='26.0 C' />
+  <location>9Ath test dive, with temperature in single sample</location>
+  <notes>Test collapse of temperature axis due to max_temp == min_temp.</notes>
+  <cylinder o2='33.0%' size='9.987 l' workpressure='206.843 bar' description='AL72' start='200.0 bar' end='100.0 bar' />
+  <cylinder o2='50.0%' size='9.987 l' workpressure='206.843 bar' description='AL72' start='200.0 bar' end='100.0 bar' />
+  <event time='15:00 min' name='gaschange' value='50' />
+  <sample time='1:00 min' depth='5 m' />
+  <sample time='2:00 min' depth='10 m' />
+  <sample time='3:00 min' depth='15 m' />
+  <sample time='4:00 min' depth='20 m' />
+  <sample time='5:00 min' depth='25 m' />
+  <sample time='6:00 min' depth='30 m' />
+  <sample time='7:00 min' depth='30 m' />
+  <sample time='8:00 min' depth='30 m' />
+  <sample time='9:00 min' depth='30 m' />
+  <sample time='10:00 min' depth='30 m' />
+  <sample time='11:00 min' depth='30 m' />
+  <sample time='12:00 min' depth='30 m' />
+  <sample time='13:00 min' depth='30 m' />
+  <sample time='14:00 min' temp='26.0 C' depth='10 m' />
+  <sample time='15:00 min' depth='15 m' />
+  <sample time='16:00 min' depth='5 m' />
+  <sample time='17:00 min' depth='10 m' />
+  <sample time='18:00 min' depth='10 m' />
+  <sample time='19:00 min' depth='10 m' />
+  <sample time='20:00 min' depth='10 m' />
+  <sample time='21:00 min' depth='10 m' />
+  <sample time='22:00 min' depth='5 m' />
+  <sample time='23:00 min' depth='5 m' />
+  <sample time='24:00 min' depth='5 m' />
+  <sample time='25:00 min' depth='5 m' />
+  <sample time='26:00 min' depth='5 m' />
+  <sample time='27:00 min' depth='5 m' />
+  <sample time='28:00 min' depth='5 m' />
+  <sample time='29:00 min' depth='2.5 m' />
+  <sample time='30:00 min' depth='0 m' />
+</dive>
+</dives>
diff --git a/qt-ui/profile/divecartesianaxis.cpp b/qt-ui/profile/divecartesianaxis.cpp
index fdcfff3c6..505b60d7e 100644
--- a/qt-ui/profile/divecartesianaxis.cpp
+++ b/qt-ui/profile/divecartesianaxis.cpp
@@ -184,7 +184,8 @@ qreal DiveCartesianAxis::posAtValue(qreal value)
 	double size = max - min;
 	// unused for now:
 	// double distanceFromOrigin = value - min;
-	double percent = (value - min) / size;
+	double percent =  IS_FP_SAME(min,max) ? 0.0 : (value - min) / size;
+
 
 	double realSize = orientation == LeftToRight || orientation == RightToLeft?
 				m.x2() - m.x1() :