--- a/Makefile
+++ b/Makefile
@@ -51,7 +51,7 @@ EXTSQL = sql/$(EXTENSION)--$(EXTVERSION)
 	sql/plproxy--unpackaged--$(EXTVERSION).sql
 
 # PostgreSQL version
-PGVER = $(shell $(PG_CONFIG) --version | sed 's/PostgreSQL //')
+PGVER = $(shell $(PG_CONFIG) --version | sed -e 's/PostgreSQL //' -e 's/ .*//')
 PGMAJOR = $(shell echo $(PGVER) | cut -d'.' -f1 | sed -r "s/([0-9]+)([^0-9].*)?/\1/")
 PGMINOR = $(shell echo $(PGVER) | cut -d'.' -f2 | sed -r "s/([0-9]+)([^0-9].*)?/\1/")
 
