diff --git a/core/units.h b/core/units.h
index a67f4aa6f..61d1a3e50 100644
--- a/core/units.h
+++ b/core/units.h
@@ -14,6 +14,7 @@ extern "C" {
 #endif
 
 #define FRACTION(n, x) ((unsigned)(n) / (x)), ((unsigned)(n) % (x))
+#define SIGNED_FRAC(n, x) ((n) >= 0 ? '+': '-'), ((n) >= 0 ? (unsigned)(n) / (x) : (-(n) / (x))), ((unsigned)((n) >= 0 ? (n) : -(n)) % (x))
 
 #define O2_IN_AIR 209 // permille
 #define N2_IN_AIR 781
diff --git a/qt-models/diveplannermodel.cpp b/qt-models/diveplannermodel.cpp
index b952202d3..1f77ab5ca 100644
--- a/qt-models/diveplannermodel.cpp
+++ b/qt-models/diveplannermodel.cpp
@@ -1258,9 +1258,9 @@ void DivePlannerPointsModel::computeVariations(struct diveplan *original_plan, c
 	restore_deco_state(save, &ds, false);
 
 	char buf[200];
-	sprintf(buf, ", %s: + %d:%02d /%s + %d:%02d /min", qPrintable(tr("Stop times")),
-		FRACTION(analyzeVariations(shallower, original, deeper, qPrintable(depth_units)), 60), qPrintable(depth_units),
-		FRACTION(analyzeVariations(shorter, original, longer, qPrintable(time_units)), 60));
+	sprintf(buf, ", %s: %c %d:%02d /%s %c %d:%02d /min", qPrintable(tr("Stop times")),
+		SIGNED_FRAC(analyzeVariations(shallower, original, deeper, qPrintable(depth_units)), 60), qPrintable(depth_units),
+		SIGNED_FRAC(analyzeVariations(shorter, original, longer, qPrintable(time_units)), 60));
 
 	// By using a signal, we can transport the variations to the main thread.
 	emit variationsComputed(QString(buf));