diff --git a/src/report/report-system/html-barchart.scm b/src/report/report-system/html-barchart.scm
index 19293997eb..caa2ecafe4 100644
--- a/src/report/report-system/html-barchart.scm
+++ b/src/report/report-system/html-barchart.scm
@@ -266,7 +266,7 @@
 (define (gnc:html-barchart-render barchart doc)
   (define (ensure-numeric elt)
     (cond ((number? elt)
-           elt)
+           (exact->inexact elt))
           ((string? elt)
            (with-input-from-string elt
              (lambda ()
diff --git a/src/report/report-system/html-piechart.scm b/src/report/report-system/html-piechart.scm
index 95384b60dc..264c4e54a8 100644
--- a/src/report/report-system/html-piechart.scm
+++ b/src/report/report-system/html-piechart.scm
@@ -136,7 +136,7 @@
     (map
      (lambda (elt)
        (cond ((number? elt)
-              (abs elt))
+              (exact->inexact (abs elt)))
              ((string? elt)
               (with-input-from-string elt
                 (lambda ()
diff --git a/src/report/report-system/html-scatter.scm b/src/report/report-system/html-scatter.scm
index 91d2dbe767..ac418fda79 100644
--- a/src/report/report-system/html-scatter.scm
+++ b/src/report/report-system/html-scatter.scm
@@ -127,7 +127,7 @@
 (define (gnc:html-scatter-render scatter doc)
   (define (ensure-numeric elt)
     (cond ((number? elt)
-           elt)
+           (exact->inexact elt))
           ((string? elt)
            (with-input-from-string elt
              (lambda ()