diff --git a/configure.ac b/configure.ac
index 3c4c8f3..a6c392a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -36,7 +36,9 @@ m4_ifdef([AM_SILENT_RULES],[AM_SILENT_RULES([yes])],
 
 dnl our libraries and install dirs use major.minor as a version
 FS_MAJORMINOR=$PACKAGE_VERSION_MAJOR.$PACKAGE_VERSION_MINOR
+FS_MAJOR_MINOR=$PACKAGE_VERSION_MAJOR\_$PACKAGE_VERSION_MINOR
 AC_SUBST(FS_MAJORMINOR)
+AC_SUBST(FS_MAJOR_MINOR)
 AC_DEFINE_UNQUOTED(FS_MAJORMINOR, "$FS_MAJORMINOR",
   [Farstream major.minor version])
 
diff --git a/farstream/Makefile.am b/farstream/Makefile.am
index 0581309..c41761e 100644
--- a/farstream/Makefile.am
+++ b/farstream/Makefile.am
@@ -96,13 +96,13 @@ introspection_sources = \
        $(libfarstreaminclude_HEADERS)
 
 INTROSPECTION_GIRS = Farstream-@FS_MAJORMINOR@.gir
-Farstream_@FS_MAJORMINOR@_gir_NAMESPACE = Farstream
-Farstream_@FS_MAJORMINOR@_gir_VERSION = @FS_MAJORMINOR@
-Farstream_@FS_MAJORMINOR@_gir_LIBS = libfarstream-@FS_MAJORMINOR@.la
-Farstream_@FS_MAJORMINOR@_gir_FILES = $(introspection_sources)
-Farstream_@FS_MAJORMINOR@_gir_INCLUDES = GObject-2.0 Gst-@GST_MAJORMINOR@
-Farstream_@FS_MAJORMINOR@_gir_CFLAGS = $(FS_INTERNAL_CFLAGS)
-Farstream_@FS_MAJORMINOR@_gir_SCANNERFLAGS = --identifier-prefix=fs_ --identifi
+Farstream_@FS_MAJOR_MINOR@_gir_NAMESPACE = Farstream
+Farstream_@FS_MAJOR_MINOR@_gir_VERSION = @FS_MAJORMINOR@
+Farstream_@FS_MAJOR_MINOR@_gir_LIBS = libfarstream-@FS_MAJORMINOR@.la
+Farstream_@FS_MAJOR_MINOR@_gir_FILES = $(introspection_sources)
+Farstream_@FS_MAJOR_MINOR@_gir_INCLUDES = GObject-2.0 Gst-@GST_MAJORMINOR@
+Farstream_@FS_MAJOR_MINOR@_gir_CFLAGS = $(FS_INTERNAL_CFLAGS)
+Farstream_@FS_MAJOR_MINOR@_gir_SCANNERFLAGS = --identifier-prefix=fs_ --identif
 
 girdir = $(datadir)/gir-1.0
 dist_gir_DATA = Farstream-@FS_MAJORMINOR@.gir