diff --git a/Makefile b/Makefile
index c231652..23251e0 100644
--- a/Makefile
+++ b/Makefile
@@ -33,9 +33,9 @@
 # Version numbers
 VERSION=121
 export RELEASE=r$(VERSION)
-LIBVER_MAJOR=`sed -n '/LZ4_VERSION_MAJOR/s/.*\s\+\([0-9]\+\).*/\1/p' < lz4.h`
-LIBVER_MINOR=`sed -n '/LZ4_VERSION_MINOR/s/.*\s\+\([0-9]\+\).*/\1/p' < lz4.h`
-LIBVER_PATCH=`sed -n '/LZ4_VERSION_RELEASE/s/.*\s\+\([0-9]\+\).*/\1/p' < lz4.h`
+LIBVER_MAJOR=`sed -n '/define LZ4_VERSION_MAJOR/s/.*[[:blank:]]\([0-9][0-9]*\).*/\1/p' < lz4.h`
+LIBVER_MINOR=`sed -n '/define LZ4_VERSION_MINOR/s/.*[[:blank:]]\([0-9][0-9]*\).*/\1/p' < lz4.h`
+LIBVER_PATCH=`sed -n '/define LZ4_VERSION_RELEASE/s/.*[[:blank:]]\([0-9][0-9]*\).*/\1/p' < lz4.h`
 LIBVER=$(LIBVER_MAJOR).$(LIBVER_MINOR).$(LIBVER_PATCH)
 
 DESTDIR=