diff --git a/src/acs/call-funcs.cpp b/src/acs/call-funcs.cpp
index 25af308f7..c9967aed1 100644
--- a/src/acs/call-funcs.cpp
+++ b/src/acs/call-funcs.cpp
@@ -2176,6 +2176,21 @@ bool CallFunc_MusicRemap(ACSVM::Thread *thread, const ACSVM::Word *argV, ACSVM::
 	return false;
 }
 
+/*--------------------------------------------------
+	bool CallFunc_Freeze(ACSVM::Thread *thread, const ACSVM::Word *argV, ACSVM::Word argC)
+
+		Updates level freeze.
+--------------------------------------------------*/
+bool CallFunc_Freeze(ACSVM::Thread *thread, const ACSVM::Word *argV, ACSVM::Word argC)
+{
+	(void)argV;
+	(void)argC;
+
+	P_SetFreezeLevel(argV[0] != 0);
+
+	return false;
+}
+
 /*--------------------------------------------------
 	bool CallFunc_Get/SetLineProperty(ACSVM::Thread *thread, const ACSVM::Word *argV, ACSVM::Word argC)
 
diff --git a/src/acs/call-funcs.hpp b/src/acs/call-funcs.hpp
index 86af95f15..e309ce4f0 100644
--- a/src/acs/call-funcs.hpp
+++ b/src/acs/call-funcs.hpp
@@ -101,6 +101,8 @@ bool CallFunc_DialogueSetSpeaker(ACSVM::Thread *thread, const ACSVM::Word *argV,
 bool CallFunc_DialogueSetCustomSpeaker(ACSVM::Thread *thread, const ACSVM::Word *argV, ACSVM::Word argC);
 bool CallFunc_DialogueNewText(ACSVM::Thread *thread, const ACSVM::Word *argV, ACSVM::Word argC);
 
+bool CallFunc_Freeze(ACSVM::Thread *thread, const ACSVM::Word *argV, ACSVM::Word argC);
+
 bool CallFunc_GetLineProperty(ACSVM::Thread *thread, const ACSVM::Word *argV, ACSVM::Word argC);
 bool CallFunc_SetLineProperty(ACSVM::Thread *thread, const ACSVM::Word *argV, ACSVM::Word argC);
 bool CallFunc_GetSideProperty(ACSVM::Thread *thread, const ACSVM::Word *argV, ACSVM::Word argC);
diff --git a/src/acs/environment.cpp b/src/acs/environment.cpp
index 796abeceb..78ac76a00 100644
--- a/src/acs/environment.cpp
+++ b/src/acs/environment.cpp
@@ -179,6 +179,7 @@ Environment::Environment()
 	addFuncDataACS0( 508, addCallFunc(CallFunc_MusicPlay));
 	addFuncDataACS0( 509, addCallFunc(CallFunc_MusicStopAll));
 	addFuncDataACS0( 510, addCallFunc(CallFunc_MusicRemap));
+	addFuncDataACS0( 511, addCallFunc(CallFunc_Freeze));
 
 	addFuncDataACS0( 600, addCallFunc(CallFunc_DialogueSetSpeaker));
 	addFuncDataACS0( 601, addCallFunc(CallFunc_DialogueSetCustomSpeaker));