diff --git a/src/configure b/src/configure
index 277b4783a2..618d296e63 100755
--- a/src/configure
+++ b/src/configure
@@ -653,7 +653,7 @@ if test "X$elf" = "Xyes"
 then
 	ELF_SYS=true
 else
-	ELF_SYS=false
+	ELF_SYS=
 fi
 
 if test "X$need_tas" = "Xyes"
diff --git a/src/configure.in b/src/configure.in
index 6293c599a9..b47aec4b7d 100644
--- a/src/configure.in
+++ b/src/configure.in
@@ -52,7 +52,7 @@ if test "X$elf" = "Xyes"
 then
 	ELF_SYS=true
 else
-	ELF_SYS=false
+	ELF_SYS=
 fi
 
 if test "X$need_tas" = "Xyes"