diff --git a/core/Makefile b/core/Makefile
index 62102f1d5..38ea2128c 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -115,7 +115,7 @@ all: check
 	$(MAKE) -f Makefile sourcemod
 
 check:
-	if [ "$(ENGSET)" == "false" ]; then \
+	if [ "$(ENGSET)" = "false" ]; then \
 		echo "You must supply ENGINE=orangebox or ENGINE=original"; \
 		exit 1; \
 	fi
diff --git a/extensions/bintools/Makefile b/extensions/bintools/Makefile
index cdffdef6c..8d97fcadf 100644
--- a/extensions/bintools/Makefile
+++ b/extensions/bintools/Makefile
@@ -106,7 +106,7 @@ all: check
 	$(MAKE) -f Makefile extension
 
 check:
-	if [ "$(USEMETA)" == "true" ] && [ "$(ENGSET)" == "false" ]; then \
+	if [ "$(USEMETA)" = "true" ] && [ "$(ENGSET)" = "false" ]; then \
 		echo "You must supply ENGINE=orangebox or ENGINE=original"; \
 		exit 1; \
 	fi
diff --git a/extensions/clientprefs/Makefile b/extensions/clientprefs/Makefile
index 653a7f562..79065fe70 100644
--- a/extensions/clientprefs/Makefile
+++ b/extensions/clientprefs/Makefile
@@ -106,7 +106,7 @@ all: check
 	$(MAKE) -f Makefile extension
 
 check:
-	if [ "$(USEMETA)" == "true" ] && [ "$(ENGSET)" == "false" ]; then \
+	if [ "$(USEMETA)" = "true" ] && [ "$(ENGSET)" = "false" ]; then \
 		echo "You must supply ENGINE=orangebox or ENGINE=original"; \
 		exit 1; \
 	fi
diff --git a/extensions/cstrike/Makefile b/extensions/cstrike/Makefile
index 457546900..9d9e85df1 100644
--- a/extensions/cstrike/Makefile
+++ b/extensions/cstrike/Makefile
@@ -105,7 +105,7 @@ all: check
 	$(MAKE) -f Makefile extension
 
 check:
-	if [ "$(USEMETA)" == "true" ] && [ "$(ENGSET)" == "false" ]; then \
+	if [ "$(USEMETA)" = "true" ] && [ "$(ENGSET)" = "false" ]; then \
 		echo "You must supply ENGINE=orangebox or ENGINE=original"; \
 		exit 1; \
 	fi
diff --git a/extensions/geoip/Makefile b/extensions/geoip/Makefile
index 42315e7bb..b6bd2508d 100644
--- a/extensions/geoip/Makefile
+++ b/extensions/geoip/Makefile
@@ -105,7 +105,7 @@ all: check
 	$(MAKE) -f Makefile extension
 
 check:
-	if [ "$(USEMETA)" == "true" ] && [ "$(ENGSET)" == "false" ]; then \
+	if [ "$(USEMETA)" = "true" ] && [ "$(ENGSET)" = "false" ]; then \
 		echo "You must supply ENGINE=orangebox or ENGINE=original"; \
 		exit 1; \
 	fi
diff --git a/extensions/mysql/Makefile b/extensions/mysql/Makefile
index 417b24ae2..9b3dffaf5 100644
--- a/extensions/mysql/Makefile
+++ b/extensions/mysql/Makefile
@@ -111,7 +111,7 @@ all: check
 	$(MAKE) -f Makefile extension
 
 check:
-	if [ "$(USEMETA)" == "true" ] && [ "$(ENGSET)" == "false" ]; then \
+	if [ "$(USEMETA)" = "true" ] && [ "$(ENGSET)" = "false" ]; then \
 		echo "You must supply ENGINE=orangebox or ENGINE=original"; \
 		exit 1; \
 	fi
diff --git a/extensions/regex/Makefile b/extensions/regex/Makefile
index c0808fd98..3186949d0 100644
--- a/extensions/regex/Makefile
+++ b/extensions/regex/Makefile
@@ -105,7 +105,7 @@ all: check
 	$(MAKE) -f Makefile extension
 
 check:
-	if [ "$(USEMETA)" == "true" ] && [ "$(ENGSET)" == "false" ]; then \
+	if [ "$(USEMETA)" = "true" ] && [ "$(ENGSET)" = "false" ]; then \
 		echo "You must supply ENGINE=orangebox or ENGINE=original"; \
 		exit 1; \
 	fi
diff --git a/extensions/sdktools/Makefile b/extensions/sdktools/Makefile
index 5b80d2275..ecc32c6b0 100644
--- a/extensions/sdktools/Makefile
+++ b/extensions/sdktools/Makefile
@@ -109,7 +109,7 @@ all: check
 	$(MAKE) -f Makefile extension
 
 check:
-	if [ "$(USEMETA)" == "true" ] && [ "$(ENGSET)" == "false" ]; then \
+	if [ "$(USEMETA)" = "true" ] && [ "$(ENGSET)" = "false" ]; then \
 		echo "You must supply ENGINE=orangebox or ENGINE=original"; \
 		exit 1; \
 	fi
diff --git a/extensions/sqlite/Makefile b/extensions/sqlite/Makefile
index 4f053e599..884c69161 100644
--- a/extensions/sqlite/Makefile
+++ b/extensions/sqlite/Makefile
@@ -132,7 +132,7 @@ all: check
 	$(MAKE) -f Makefile extension
 
 check:
-	if [ "$(USEMETA)" == "true" ] && [ "$(ENGSET)" == "false" ]; then \
+	if [ "$(USEMETA)" = "true" ] && [ "$(ENGSET)" = "false" ]; then \
 		echo "You must supply ENGINE=orangebox or ENGINE=original"; \
 		exit 1; \
 	fi
diff --git a/extensions/structs/Makefile b/extensions/structs/Makefile
index 0b75edc70..823443649 100644
--- a/extensions/structs/Makefile
+++ b/extensions/structs/Makefile
@@ -105,7 +105,7 @@ all: check
 	$(MAKE) -f Makefile extension
 
 check:
-	if [ "$(USEMETA)" == "true" ] && [ "$(ENGSET)" == "false" ]; then \
+	if [ "$(USEMETA)" = "true" ] && [ "$(ENGSET)" = "false" ]; then \
 		echo "You must supply ENGINE=orangebox or ENGINE=original"; \
 		exit 1; \
 	fi
diff --git a/extensions/tf2/Makefile b/extensions/tf2/Makefile
index 1b4726e42..e6e56ec87 100644
--- a/extensions/tf2/Makefile
+++ b/extensions/tf2/Makefile
@@ -108,7 +108,7 @@ all: check
 	$(MAKE) -f Makefile extension
 
 check:
-	if [ "$(USEMETA)" == "true" ] && [ "$(ENGSET)" == "false" ]; then \
+	if [ "$(USEMETA)" = "true" ] && [ "$(ENGSET)" = "false" ]; then \
 		echo "You must supply ENGINE=orangebox or ENGINE=original"; \
 		exit 1; \
 	fi
diff --git a/extensions/topmenus/Makefile b/extensions/topmenus/Makefile
index f2c7e3e19..07cb4ef12 100644
--- a/extensions/topmenus/Makefile
+++ b/extensions/topmenus/Makefile
@@ -107,7 +107,7 @@ all: check
 	$(MAKE) -f Makefile extension
 
 check:
-	if [ "$(USEMETA)" == "true" ] && [ "$(ENGSET)" == "false" ]; then \
+	if [ "$(USEMETA)" = "true" ] && [ "$(ENGSET)" = "false" ]; then \
 		echo "You must supply ENGINE=orangebox or ENGINE=original"; \
 		exit 1; \
 	fi
diff --git a/public/mms_sample_ext/Makefile b/public/mms_sample_ext/Makefile
index 6744c63c9..8d55d3668 100644
--- a/public/mms_sample_ext/Makefile
+++ b/public/mms_sample_ext/Makefile
@@ -89,7 +89,7 @@ all: check
 	$(MAKE) -f Makefile mms_ext
 
 check:
-	if [ "$(ENGSET)" == "false" ]; then \
+	if [ "$(ENGSET)" = "false" ]; then \
 		echo "You must supply ENGINE=orangebox or ENGINE=original"; \
 		exit 1; \
 	fi
diff --git a/public/sample_ext/Makefile b/public/sample_ext/Makefile
index 16bd4ea46..b9237b17b 100644
--- a/public/sample_ext/Makefile
+++ b/public/sample_ext/Makefile
@@ -105,7 +105,7 @@ all: check
 	$(MAKE) -f Makefile extension
 
 check:
-	if [ "$(USEMETA)" == "true" ] && [ "$(ENGSET)" == "false" ]; then \
+	if [ "$(USEMETA)" = "true" ] && [ "$(ENGSET)" = "false" ]; then \
 		echo "You must supply ENGINE=orangebox or ENGINE=original"; \
 		exit 1; \
 	fi