diff --git a/configure b/configure
index 2b863be108be26..21a3af145c1369 100755
--- a/configure
+++ b/configure
@@ -8398,8 +8398,7 @@ $as_echo "$BOLT_INSTRUMENT_FLAGS" >&6; }
 $as_echo_n "checking BOLT_APPLY_FLAGS... " >&6; }
 if test -z "${BOLT_APPLY_FLAGS}"
 then
-  BOLT_APPLY_FLAGS=-update-debug-sections -reorder-blocks=ext-tsp -reorder-functions=hfsort+ -split-functions -icf=1 -inline-all -split-eh -reorder-functions-use-hot-size -peepholes=none -jump-tables=aggressive -inline-ap -indirect-call-promotion=all -dyno-stats -use-gnu-stack -frame-opt=hot
-
+  BOLT_APPLY_FLAGS=" -update-debug-sections -reorder-blocks=ext-tsp -reorder-functions=hfsort+ -split-functions -icf=1 -inline-all -split-eh -reorder-functions-use-hot-size -peepholes=none -jump-tables=aggressive -inline-ap -indirect-call-promotion=all -dyno-stats -use-gnu-stack -frame-opt=hot "
 
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $BOLT_APPLY_FLAGS" >&5
diff --git a/configure.ac b/configure.ac
index 786d3414eb0e06..c5a79af1a2e2eb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2087,23 +2087,23 @@ if test -z "${BOLT_APPLY_FLAGS}"
 then
   AS_VAR_SET(
     [BOLT_APPLY_FLAGS],
-    [m4_join([ ],
-      [-update-debug-sections],
-      [-reorder-blocks=ext-tsp],
-      [-reorder-functions=hfsort+],
-      [-split-functions],
-      [-icf=1],
-      [-inline-all],
-      [-split-eh],
-      [-reorder-functions-use-hot-size],
-      [-peepholes=none],
-      [-jump-tables=aggressive],
-      [-inline-ap],
-      [-indirect-call-promotion=all],
-      [-dyno-stats],
-      [-use-gnu-stack],
-      [-frame-opt=hot]
-    )]
+    [m4_normalize("
+     -update-debug-sections
+     -reorder-blocks=ext-tsp
+     -reorder-functions=hfsort+
+     -split-functions
+     -icf=1
+     -inline-all
+     -split-eh
+     -reorder-functions-use-hot-size
+     -peepholes=none
+     -jump-tables=aggressive
+     -inline-ap
+     -indirect-call-promotion=all
+     -dyno-stats
+     -use-gnu-stack
+     -frame-opt=hot
+   ")]
   )
 fi
 AC_MSG_RESULT([$BOLT_APPLY_FLAGS])