diff --git a/src/core/opamConsole.ml b/src/core/opamConsole.ml
index 154645ee0f6..08b1ecf3fed 100644
--- a/src/core/opamConsole.ml
+++ b/src/core/opamConsole.ml
@@ -209,11 +209,11 @@ let style_code (c: text_style) = match c with
 (* not nestable *)
 let colorise style s =
   if not (color ()) then s else
-    Printf.sprintf "\027[%sm%s\027[m" (style_code style) s
+    Printf.sprintf "\027[%sm%s\027[0m" (style_code style) s
 
 let colorise' styles s =
   if not (color ()) then s else
-    Printf.sprintf "\027[%sm%s\027[m"
+    Printf.sprintf "\027[%sm%s\027[0m"
       (String.concat ";" (List.map style_code styles))
       s
 
diff --git a/tests/Makefile b/tests/Makefile
index 1a75b5ddc07..d6bc572bb71 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -52,14 +52,14 @@ printf = /usr/bin/printf
 define RUN
 @COUNT=$$(ls -1 $(REPOKIND)-*.log 2>/dev/null | wc -l); \
 LOG=$$($(printf) "$(REPOKIND)-%02d-$(1).log" $$COUNT); \
-$(printf) "  %02d \e[1m%-20s\e[m ..................................... " \
+$(printf) "  %02d \e[1m%-20s\e[0m ..................................... " \
   $$COUNT $(1); \
 if $(MAKE) $(1) >$$LOG 2>&1; then \
-  $(printf) "\e[32m[ OK ]\e[m\n"; \
+  $(printf) "\e[32m[ OK ]\e[0m\n"; \
 else \
-  $(printf) "\e[31m$(1) FAILED\e[m\n\n" >>$$LOG; \
-  $(printf) "\e[31m[FAIL]\e[m\n"; \
-  { $(printf) "\e[31m>> %s FAILED <<\e[m\n" $(1); cat $$LOG; } \
+  $(printf) "\e[31m$(1) FAILED\e[0m\n\n" >>$$LOG; \
+  $(printf) "\e[31m[FAIL]\e[0m\n"; \
+  { $(printf) "\e[31m>> %s FAILED <<\e[0m\n" $(1); cat $$LOG; } \
 	>> failed-$(REPOKIND).log; \
 fi; \
 cat $$LOG >> fulltest-$(REPOKIND).log