diff --git a/src/main.c b/src/main.c
index 94ba6638..fe8c30ab 100644
--- a/src/main.c
+++ b/src/main.c
@@ -24,6 +24,7 @@
 #ifdef __unix__
 #include <sys/wait.h>
 #endif
+#include <locale.h>
 
 void sig_handler(int s){
 #ifndef IN_MEMORY_UNDO
diff --git a/src/xschem.tcl b/src/xschem.tcl
index dfa975d9..6f01e2c3 100644
--- a/src/xschem.tcl
+++ b/src/xschem.tcl
@@ -3225,6 +3225,7 @@ proc build_windows {} {
 ###
 
 set OS [lindex $tcl_platform(os) 0]
+set env(LC_ALL) C
 
 # tcl variable XSCHEM_LIBRARY_PATH  should already be set in xschemrc
 set pathlist {}