diff --git a/Makefile b/Makefile
index 3ef380943f..1dd2ba899d 100644
--- a/Makefile
+++ b/Makefile
@@ -63,7 +63,7 @@ all: px4_sitl_default
 space := $(subst ,, )
 
 define make_list
-     $(shell cat .github/workflows/compile_${1}.yml | sed -E 's/[[:space:]]+(.*),/check_\1/g' | grep check_${2})
+     $(shell cat .github/workflows/compile_${1}.yml | sed -E 's|[[:space:]]+(.*),|check_\1|g' | grep check_${2})
 endef
 
 # Parsing
@@ -77,7 +77,7 @@ ARGS := $(wordlist 2,$(words $(MAKECMDGOALS)),$(MAKECMDGOALS))
 # Get -j or --jobs argument as suggested in:
 # https://stackoverflow.com/a/33616144/8548472
 MAKE_PID := $(shell echo $$PPID)
-j := $(shell ps T | sed -n 's/.*$(MAKE_PID).*$(MAKE).* \(-j\|--jobs\) *\([0-9][0-9]*\).*/\2/p')
+j := $(shell ps T | sed -n 's|.*$(MAKE_PID).*$(MAKE).* \(-j\|--jobs\) *\([0-9][0-9]*\).*|\2|p')
 
 # Default j for clang-tidy
 j_clang_tidy := $(or $(j),4)
@@ -189,9 +189,9 @@ endef
 define cmake-cache-check
 	@# change to build folder which fails if it doesn't exist and CACHED_CMAKE_OPTIONS stays empty
 	@# fetch all previously configured and cached options from the build folder and transform them into the OPTION=VALUE format without type (e.g. :BOOL)
-	@$(eval CACHED_CMAKE_OPTIONS = $(shell cd $(BUILD_DIR) 2>/dev/null && cmake -L 2>/dev/null | sed -n 's/\([^[:blank:]]*\):[^[:blank:]]*\(=[^[:blank:]]*\)/\1\2/gp' ))
+	@$(eval CACHED_CMAKE_OPTIONS = $(shell cd $(BUILD_DIR) 2>/dev/null && cmake -L 2>/dev/null | sed -n 's|\([^[:blank:]]*\):[^[:blank:]]*\(=[^[:blank:]]*\)|\1\2|gp' ))
 	@# transform the options in CMAKE_ARGS into the OPTION=VALUE format without -D
-	@$(eval DESIRED_CMAKE_OPTIONS = $(shell echo $(CMAKE_ARGS) | sed -n 's/-D\([^[:blank:]]*=[^[:blank:]]*\)/\1/gp' ))
+	@$(eval DESIRED_CMAKE_OPTIONS = $(shell echo $(CMAKE_ARGS) | sed -n 's|-D\([^[:blank:]]*=[^[:blank:]]*\)|\1|gp' ))
 	@# find each currently desired option in the already cached ones making sure the complete configured string value is the same
 	@$(eval VERIFIED_CMAKE_OPTIONS = $(foreach option,$(DESIRED_CMAKE_OPTIONS),$(strip $(findstring $(option)$(space),$(CACHED_CMAKE_OPTIONS)))))
 	@# if the complete list of desired options is found in the list of verified options we don't need to reconfigure and CMAKE_CACHE_CHECK stays empty
@@ -206,7 +206,7 @@ define colorecho
 endef
 
 # Get a list of all config targets boards/*/*.cmake
-ALL_CONFIG_TARGETS := $(shell find boards -maxdepth 3 -mindepth 3 ! -name '*common*' ! -name '*sdflight*' -name '*.cmake' -print | sed -e 's/boards\///' | sed -e 's/\.cmake//' | sed -e 's/\//_/g' | sort)
+ALL_CONFIG_TARGETS := $(shell find boards -maxdepth 3 -mindepth 3 ! -name '*common*' ! -name '*sdflight*' -name '*.cmake' -print | sed -e 's|boards\/||' | sed -e 's|\.cmake||' | sed -e 's|\/|_|g' | sort)
 
 # ADD CONFIGS HERE
 # --------------------------------------------------------------------