diff --git a/ChangeLog b/ChangeLog
index fb54cb4..3577425 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2007-10-12  Richard B. Kreckel  <kreckel@ginac.de>
+
+	Fix compilation on CYGWIN:
+	* src/float/transcendental/cl_LF_zeta_int.cc: Avoid leading underscores
+	in variable names.
+	* src/float/transcendental/cl_LF_eulerconst.cc: Likewise.
+	Reported by Chris Bouchard <cbouchrd@uiuc.edu>.
+
 2007-10-10  Richard B. Kreckel  <kreckel@ginac.de>
 
 	* src/base/cl_low.h: Add missing linefeeds in SPARC 64 inline assembler.
diff --git a/src/float/transcendental/cl_LF_eulerconst.cc b/src/float/transcendental/cl_LF_eulerconst.cc
index 55269cf..7eff07f 100644
--- a/src/float/transcendental/cl_LF_eulerconst.cc
+++ b/src/float/transcendental/cl_LF_eulerconst.cc
@@ -462,9 +462,9 @@ const cl_LF compute_eulerconst_besselintegral4 (uintC len)
 			thiss.n = n+1;
 			return result;
 		}
-		rational_series_stream (uintC _n, const cl_I& _x)
+		rational_series_stream (uintC n_, const cl_I& x_)
 			: cl_pqd_series_stream (rational_series_stream::computenext),
-			  n (_n), x (_x) {}
+			  n (n_), x (x_) {}
 	} series(0,x);
 	var cl_pqd_series_result<cl_R> sums;
 	eval_pqd_series_aux(N,series,sums,actuallen);
diff --git a/src/float/transcendental/cl_LF_zeta_int.cc b/src/float/transcendental/cl_LF_zeta_int.cc
index 9d51282..433b7fc 100644
--- a/src/float/transcendental/cl_LF_zeta_int.cc
+++ b/src/float/transcendental/cl_LF_zeta_int.cc
@@ -112,9 +112,9 @@ const cl_LF compute_zeta_cvz2 (int s, uintC len)
 			thiss.n = n+1;
 			return result;
 		}
-		rational_series_stream (int _s, uintC _N)
+		rational_series_stream (int s_, uintC N_)
 			: cl_pqd_series_stream (rational_series_stream::computenext),
-			  n (0), s (_s), N (_N) {}
+			  n (0), s (s_), N (N_) {}
 	} series(s,N);
 	var cl_pqd_series_result<cl_I> sums;
 	eval_pqd_series_aux(N,series,sums,actuallen);