diff --git a/makefiles/Makefile.cpp.mk b/makefiles/Makefile.cpp.mk
index b8a560a209..1ace49eb30 100644
--- a/makefiles/Makefile.cpp.mk
+++ b/makefiles/Makefile.cpp.mk
@@ -900,10 +900,10 @@ FLATZINC_LIB_OBJS=\
 	$(OBJ_DIR)/flatzinc/parser.$O\
 	$(OBJ_DIR)/flatzinc/registry.$O
 
-$(GEN_DIR)/flatzinc/flatzinc.yy.cc: $(SRC_DIR)/flatzinc/flatzinc.lex
+$(GEN_DIR)/flatzinc/flatzinc.yy.cc: $(SRC_DIR)/flatzinc/flatzinc.lex $(FLEX)
 	$(FLEX) -o$(GEN_DIR)/flatzinc/flatzinc.yy.cc $(SRC_DIR)/flatzinc/flatzinc.lex
 
-$(GEN_DIR)/flatzinc/flatzinc.tab.cc: $(SRC_DIR)/flatzinc/flatzinc.yy
+$(GEN_DIR)/flatzinc/flatzinc.tab.cc: $(SRC_DIR)/flatzinc/flatzinc.yy $(BISON)
 	$(BISON) -t -o $(GEN_DIR)/flatzinc/flatzinc.tab.cc -d $<
 
 $(GEN_DIR)/flatzinc/flatzinc.tab.hh: $(GEN_DIR)/flatzinc/flatzinc.tab.cc
diff --git a/makefiles/Makefile.third_party.win b/makefiles/Makefile.third_party.win
index 6407891689..74de95aede 100644
--- a/makefiles/Makefile.third_party.win
+++ b/makefiles/Makefile.third_party.win
@@ -7,6 +7,7 @@ CBC_TAG = 2.8.7
 ZLIB_TAG = 1.2.8
 ZLIB_ARCHIVE_TAG = 128
 SWIG_TAG = 2.0.11
+BISON_FLEX_TAG = 2.5.2
 
 # Build extra dependencies (GLPK, SCIP) from archive only if the archive is present.
 # The archive should be glpk-4.53.tar.gz
@@ -308,6 +309,18 @@ ifeq ("$(VisualStudioVersion)", "12.0")
 	svn revert dependencies/solutions/Scip/scip/scip.vcxproj
 endif
 
+# Install bison and flex in one package.
+install_bison: dependencies\install\bin\win_bison.exe
+
+dependencies\install\bin\win_flex.exe: dependencies\install\bin\win_bison.exe
+
+dependencies\install\bin\win_bison.exe: dependencies\archives\win_flex_bison-$(BISON_FLEX_TAG).zip
+	tools\unzip -d dependencies/install\bin dependencies\archives\win_flex_bison-$(BISON_FLEX_TAG).zip
+	tools\touch.exe dependencies\install\bin/win_bison.exe
+
+dependencies\archives\win_flex_bison-$(BISON_FLEX_TAG).zip:
+	tools\wget -P dependencies\archives http://sourceforge.net/projects/winflexbison/files/win_flex_bison-$(BISON_FLEX_TAG).zip
+
 # Clean everything.
 clean_third_party:
 	-$(DEL) Makefile.local
diff --git a/makefiles/Makefile.win b/makefiles/Makefile.win
index 421334474f..e68b55730b 100644
--- a/makefiles/Makefile.win
+++ b/makefiles/Makefile.win
@@ -35,8 +35,8 @@ MKDIR = md
 COPY = copy
 TOUCH = tools\touch.exe
 SED = tools\sed.exe
-BISON = tools\bison.exe
-FLEX = tools\flex.exe
+BISON = dependencies\install\bin\win_bison.exe
+FLEX = dependencies\install\bin\win_flex.exe
 
 # Compilation macros.
 DEBUG=/O2 -DNDEBUG
diff --git a/src/flatzinc2/parser.lex b/src/flatzinc2/parser.lex
index d143b54577..806a21d7b3 100644
--- a/src/flatzinc2/parser.lex
+++ b/src/flatzinc2/parser.lex
@@ -13,6 +13,11 @@
 #include "base/strtoint.h"
 #include "flatzinc2/parser.tab.hh"
 using operations_research::atoi64;
+#if defined(_MSC_VER)
+#define YY_NO_UNISTD_H
+#include "io.h"
+#define isatty _isatty
+#endif
 %}
 
 /* Rules that parse the bottom-line string tokens of a .fz file and
diff --git a/tools/bison.exe b/tools/bison.exe
deleted file mode 100644
index a56f1cb363..0000000000
Binary files a/tools/bison.exe and /dev/null differ