X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?a=blobdiff_plain;f=ginac%2Fnumeric.h;h=eec54fff97b8386e1dd64bfad5892854b228e72f;hb=27d6204effdef95a00af461fff98024e290dbaa7;hp=6599ffbc681245004f009aa31ccb35b7f17bb80f;hpb=4a2bfea67bf250ebd88778f616dab442df2510fd;p=ginac.git

diff --git a/ginac/numeric.h b/ginac/numeric.h
index 6599ffbc..eec54fff 100644
--- a/ginac/numeric.h
+++ b/ginac/numeric.h
@@ -96,7 +96,7 @@ public:
 protected:
 	/** Implementation of ex::diff for a numeric always returns 0.
 	 *  @see ex::diff */
-	ex derivative(const symbol &s) const { return _ex0(); }
+	ex derivative(const symbol &s) const { return 0; }
 	bool is_equal_same_type(const basic &other) const;
 	unsigned calchash(void) const;