diff --git a/compiler/Makefile b/compiler/Makefile
index f6d447546b..5707d16f50 100644
--- a/compiler/Makefile
+++ b/compiler/Makefile
@@ -3290,6 +3290,9 @@ ifdef CMP
 override DIFF:=$(CMP) -i218
 endif
 endif
+ifndef ALLOW_WARNINGS
+override LOCALOPT+=-Sew
+endif
 override COMPILER+=$(LOCALOPT)
 PASDOC:=$(strip $(wildcard $(addsuffix /pasdoc.exe,$(SEARCHPATH))))
 ifeq ($(PASDOC),)
diff --git a/compiler/Makefile.fpc b/compiler/Makefile.fpc
index b7e15e95e0..e93e8951e6 100644
--- a/compiler/Makefile.fpc
+++ b/compiler/Makefile.fpc
@@ -268,6 +268,12 @@ override DIFF:=$(CMP) -i218
 endif
 endif
 
+# Use -Sew option by default
+# Allow disabling by setting ALLOW_WARINGS=1
+ifndef ALLOW_WARNINGS
+override LOCALOPT+=-Sew
+endif
+
 # Add Local options
 override COMPILER+=$(LOCALOPT)