diff --git a/src/traces/bar/set_positions.js b/src/traces/bar/set_positions.js
index dbc68616224..2a670a63536 100644
--- a/src/traces/bar/set_positions.js
+++ b/src/traces/bar/set_positions.js
@@ -148,8 +148,11 @@ module.exports = function setPositions(gd, plotinfo) {
                     if(!isNumeric(ti[j].s)) continue;
 
                     sv = Math.round(ti[j].p / sumround);
-                    // store the negative sum value for p at the same key, with sign flipped
-                    if(relative && ti[j].s < 0) sv = -sv;
+
+                    // store the negative sum value for p at the same key,
+                    // with sign flipped using string to ensure -0 !== 0.
+                    if(relative && ti[j].s < 0) sv = '-' + sv;
+
                     var previousSum = sums[sv] || 0;
                     if(stack || relative) ti[j].b = previousSum;
                     barEnd = ti[j].b + ti[j].s;
@@ -167,20 +170,29 @@ module.exports = function setPositions(gd, plotinfo) {
             }
 
             if(norm) {
-                padded = false;
                 var top = norm === 'fraction' ? 1 : 100,
                     relAndNegative = false,
                     tiny = top / 1e9; // in case of rounding error in sum
+
+                padded = false;
                 sMin = 0;
                 sMax = stack ? top : 0;
+
                 for(i = 0; i < bl.length; i++) { // trace index
                     ti = gd.calcdata[bl[i]];
+
                     for(j = 0; j < ti.length; j++) {
-                        relAndNegative = relative && ti[j].s < 0;
+                        relAndNegative = (relative && ti[j].s < 0);
+
                         sv = Math.round(ti[j].p / sumround);
-                        if(relAndNegative) sv = -sv;  // locate negative sum amount for this p val
+
+                        // locate negative sum amount for this p val
+                        if(relAndNegative) sv = '-' + sv;
+
                         scale = top / sums[sv];
-                        if(relAndNegative) scale *= -1; // preserve sign if negative
+
+                        // preserve sign if negative
+                        if(relAndNegative) scale *= -1;
                         ti[j].b *= scale;
                         ti[j].s *= scale;
                         barEnd = ti[j].b + ti[j].s;
diff --git a/test/jasmine/tests/bar_test.js b/test/jasmine/tests/bar_test.js
index 365891170d9..be35de30694 100644
--- a/test/jasmine/tests/bar_test.js
+++ b/test/jasmine/tests/bar_test.js
@@ -183,4 +183,44 @@ describe('heatmap calc / setPositions', function() {
         assertTraceField(out, 't.dbar', [1, 1]);
     });
 
+    it('should fill in calc pt fields (relative case)', function() {
+        var out = _calc([{
+            y: [20, 14, -23]
+        }, {
+            y: [-12, -18, -29]
+        }], {
+            barmode: 'relative'
+        });
+
+        assertPtField(out, 'x', [[0, 1, 2], [0, 1, 2]]);
+        assertPtField(out, 'y', [[20, 14, -23], [-12, -18, -52]]);
+        assertPtField(out, 'b', [[0, 0, 0], [0, 0, -23]]);
+        assertPtField(out, 's', [[20, 14, -23], [-12, -18, -29]]);
+        assertPtField(out, 'p', [[0, 1, 2], [0, 1, 2]]);
+        assertTraceField(out, 't.barwidth', [0.8, 0.8]);
+        assertTraceField(out, 't.poffset', [-0.4, -0.4]);
+        assertTraceField(out, 't.dbar', [1, 1]);
+    });
+
+    it('should fill in calc pt fields (relative / percent case)', function() {
+        var out = _calc([{
+            x: ['A', 'B', 'C', 'D'],
+            y: [20, 14, 40, -60]
+        }, {
+            x: ['A', 'B', 'C', 'D'],
+            y: [-12, -18, 60, -40]
+        }], {
+            barmode: 'relative',
+            barnorm: 'percent'
+        });
+
+        assertPtField(out, 'x', [[0, 1, 2, 3], [0, 1, 2, 3]]);
+        assertPtField(out, 'y', [[100, 100, 40, -60], [-100, -100, 100, -100]]);
+        assertPtField(out, 'b', [[0, 0, 0, 0], [0, 0, 40, -60]]);
+        assertPtField(out, 's', [[100, 100, 40, -60], [-100, -100, 60, -40]]);
+        assertPtField(out, 'p', [[0, 1, 2, 3], [0, 1, 2, 3]]);
+        assertTraceField(out, 't.barwidth', [0.8, 0.8]);
+        assertTraceField(out, 't.poffset', [-0.4, -0.4]);
+        assertTraceField(out, 't.dbar', [1, 1]);
+    });
 });