1 files changed, 2 insertions, 2 deletions

diff --git a/js/RrdRpn.js b/js/RrdRpn.js
index cbb5e8f..5ca8daf 100644
--- a/js/RrdRpn.js
+++ b/js/RrdRpn.js
@@ -478,7 +478,7 @@ RrdRpn.prototype.calc = function (data_idx, output, output_idx)
                                 break;
                         case RrdRpn.OP_ISINF:
                                 if(stptr < 0) throw new RrdRpnError();
-                                this.rpnstack[stptr] = isInfinite(this.rpnstack[stptr]) ? 1.0 : 0.0;
+                                this.rpnstack[stptr] = !isFinite(this.rpnstack[stptr]) ? 1.0 : 0.0;
                                 break;
                         case RrdRpn.OP_SQRT:
                                 if(stptr < 0) throw new RrdRpnError();
@@ -603,7 +603,7 @@ RrdRpn.prototype.calc = function (data_idx, output, output_idx)
                                 break;
                         case RrdRpn.OP_ABS:
                                 if(stptr < 0) throw new RrdRpnError();
-                                this.rpnstack[stptr] = fabs(this.rpnstack[stptr]);
+                                this.rpnstack[stptr] = Math.abs(this.rpnstack[stptr]);
                                 break;
                         case RrdRpn.OP_END:
                                 break;