diff --git a/Makefile.am b/Makefile.am
index 06832cae..ab932857 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -28,8 +28,14 @@ local_includes = -Iinclude -I$(srcdir)/include -I$(srcdir)/src -I.
 if BINDINGS_CXX
 local_includes += -Ibindings/cxx/include -I$(srcdir)/bindings/cxx/include -Ibindings/cxx
 endif
+# Do not hard-code the firmware location on Windows.
+if WIN32
+global_defs =
+else
+global_defs = -DFIRMWARE_DIR='"$(FIRMWARE_DIR)"'
+endif
 # Ensure that local include directories are always searched first.
-AM_CPPFLAGS = $(local_includes) -DFIRMWARE_DIR='"$(FIRMWARE_DIR)"'
+AM_CPPFLAGS = $(local_includes) $(global_defs)
 
 # The tests CFLAGS are a superset of the libsigrok CFLAGS, and the
 # python bindings CFLAGS are a superset of the C++ bindings CFLAGS.
diff --git a/configure.ac b/configure.ac
index ba98f3e8..0ffb23c8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -69,6 +69,8 @@ SR_PKG_VERSION_SET([SR_PACKAGE_VERSION], [AC_PACKAGE_VERSION])
 # http://www.gnu.org/software/libtool/manual/libtool.html#Updating-version-info
 SR_LIB_VERSION_SET([SR_LIB_VERSION], [2:0:0])
 
+AM_CONDITIONAL([WIN32], [test -z "${host_os##mingw*}" || test -z "${host_os##cygwin*}"])
+
 #############################
 ##  Optional dependencies  ##
 #############################