diff --git a/parser/parser.h b/parser/parser.h
index 986884114..4ab4c5c72 100644
--- a/parser/parser.h
+++ b/parser/parser.h
@@ -66,10 +66,12 @@ extern int parser_token;
 #define WARN_FORMAT		0x400
 #define WARN_MISSING		0x800
 #define WARN_OVERRIDE		0x1000
+#define WARN_INCLUDE		0x2000
 
 #define WARN_DEV (WARN_RULE_NOT_ENFORCED | WARN_RULE_DOWNGRADED | WARN_ABI | \
 		  WARN_DEPRECATED | WARN_DANGEROUS | WARN_UNEXPECTED | \
-		  WARN_FORMAT | WARN_MISSING | WARN_OVERRIDE | WARN_DEBUG_CACHE)
+		  WARN_FORMAT | WARN_MISSING | WARN_OVERRIDE | \
+		  WARN_DEBUG_CACHE | WARN_INCLUDE)
 
 #define DEFAULT_WARNINGS (WARN_CONFIG | WARN_CACHE | WARN_JOBS | \
 			  WARN_UNEXPECTED | WARN_OVERRIDE)
@@ -77,7 +79,8 @@ extern int parser_token;
 #define WARN_ALL (WARN_RULE_NOT_ENFORCED | WARN_RULE_DOWNGRADED | WARN_ABI | \
 		  WARN_DEPRECATED | WARN_CONFIG | WARN_CACHE | \
 		  WARN_DEBUG_CACHE | WARN_JOBS | WARN_DANGEROUS | \
-		  WARN_UNEXPECTED | WARN_FORMAT | WARN_MISSING | WARN_OVERRIDE)
+		  WARN_UNEXPECTED | WARN_FORMAT | WARN_MISSING | \
+		  WARN_OVERRIDE | WARN_INCLUDE)
 
 extern dfaflags_t warnflags;
 extern dfaflags_t werrflags;
diff --git a/parser/parser_lex.l b/parser/parser_lex.l
index 7d99cc0f2..e02575dae 100644
--- a/parser/parser_lex.l
+++ b/parser/parser_lex.l
@@ -613,6 +613,7 @@ GT		>
 	/* Don't use PUSH() macro here as we don't want #include echoed out.
 	 * It needs to be handled specially
 	 */
+	pwarn(WARN_INCLUDE, _("deprecated use of '#include'\n"));
 	yy_push_state(INCLUDE_EXISTS);
 }
 
@@ -627,6 +628,7 @@ include{WS}+if{WS}+exists/{WS}	{
 	/* Don't use PUSH() macro here as we don't want #include echoed out.
 	 * It needs to be handled specially
 	 */
+	pwarn(WARN_INCLUDE, _("deprecated use of '#include'\n"));
 	yy_push_state(INCLUDE);
 }
 
diff --git a/parser/parser_main.c b/parser/parser_main.c
index 5a6baf1cb..e4f9be8a7 100644
--- a/parser/parser_main.c
+++ b/parser/parser_main.c
@@ -269,6 +269,7 @@ optflag_table_t warnflag_table[] = {
 	{ 1, "missing", "warn when missing qualifier and a default is used", WARN_MISSING },
 	{ 1, "override", "warn when overriding", WARN_OVERRIDE },
 	{ 1, "dev", "turn on warnings that are useful for profile development", WARN_DEV },
+	{ 1, "pound-include", "warn when #include is used", WARN_INCLUDE },
 	{ 1, "all", "turn on all warnings", WARN_ALL},
 	{ 0, NULL, NULL, 0 },
 };