diff --git a/Source/JavaScriptCore/runtime/MachineContext.h b/Source/JavaScriptCore/runtime/MachineContext.h
index c5052527..dabd3733 100644
--- a/Source/JavaScriptCore/runtime/MachineContext.h
+++ b/Source/JavaScriptCore/runtime/MachineContext.h
@@ -196,7 +196,7 @@ static inline void*& stackPointerImpl(mcontext_t& machineContext)
 #error Unknown Architecture
 #endif
 
-#elif OS(FUCHSIA) || defined(__GLIBC__) || defined(__BIONIC__)
+#elif OS(FUCHSIA) || defined(__linux__)
 
 #if CPU(X86)
     return reinterpret_cast<void*&>((uintptr_t&) machineContext.gregs[REG_ESP]);
@@ -347,7 +347,7 @@ static inline void*& framePointerImpl(mcontext_t& machineContext)
 #error Unknown Architecture
 #endif
 
-#elif OS(FUCHSIA) || defined(__GLIBC__) || defined(__BIONIC__)
+#elif OS(FUCHSIA) || defined(__linux__)
 
 // The following sequence depends on glibc's sys/ucontext.h.
 #if CPU(X86)
@@ -498,7 +498,7 @@ static inline void*& instructionPointerImpl(mcontext_t& machineContext)
 #error Unknown Architecture
 #endif
 
-#elif OS(FUCHSIA) || defined(__GLIBC__) || defined(__BIONIC__)
+#elif OS(FUCHSIA) || defined(__linux__)
 
 // The following sequence depends on glibc's sys/ucontext.h.
 #if CPU(X86)
@@ -656,7 +656,7 @@ inline void*& argumentPointer<1>(mcontext_t& machineContext)
 #error Unknown Architecture
 #endif
 
-#elif OS(FUCHSIA) || defined(__GLIBC__) || defined(__BIONIC__)
+#elif OS(FUCHSIA) || defined(__linux__)
 
 // The following sequence depends on glibc's sys/ucontext.h.
 #if CPU(X86)
@@ -773,7 +773,7 @@ inline void*& llintInstructionPointer(mcontext_t& machineContext)
 #error Unknown Architecture
 #endif
 
-#elif OS(FUCHSIA) || defined(__GLIBC__) || defined(__BIONIC__)
+#elif OS(FUCHSIA) || defined(__linux__)
 
 // The following sequence depends on glibc's sys/ucontext.h.
 #if CPU(X86)
diff --git a/Source/WebCore/xml/XPathGrammar.cpp b/Source/WebCore/xml/XPathGrammar.cpp
index 0875a5ec..98d51533 100644
--- a/Source/WebCore/xml/XPathGrammar.cpp
+++ b/Source/WebCore/xml/XPathGrammar.cpp
@@ -966,7 +966,7 @@ int yydebug;
 #if YYERROR_VERBOSE
 
 # ifndef yystrlen
-#  if defined __GLIBC__ && defined _STRING_H
+#  if defined __linux__ && defined _STRING_H
 #   define yystrlen strlen
 #  else
 /* Return the length of YYSTR.  */
@@ -989,7 +989,7 @@ yystrlen (yystr)
 # endif
 
 # ifndef yystpcpy
-#  if defined __GLIBC__ && defined _STRING_H && defined _GNU_SOURCE
+#  if defined __linux__ && defined _STRING_H && defined _GNU_SOURCE
 #   define yystpcpy stpcpy
 #  else
 /* Copy YYSRC to YYDEST, returning the address of the terminating '\0' in
diff --git a/Source/JavaScriptCore/runtime/OptionsList.h b/Source/JavaScriptCore/runtime/OptionsList.h
index 41cab118..2ac66c7a 100644
--- a/Source/JavaScriptCore/runtime/OptionsList.h
+++ b/Source/JavaScriptCore/runtime/OptionsList.h
@@ -90,9 +90,9 @@ constexpr bool enableWebAssemblyStreamingApi = false;
     \
     v(Bool, reportMustSucceedExecutableAllocations, false, Normal, nullptr) \
     \
-    v(Unsigned, maxPerThreadStackUsage, 5 * MB, Normal, "Max allowed stack usage by the VM") \
-    v(Unsigned, softReservedZoneSize, 128 * KB, Normal, "A buffer greater than reservedZoneSize that reserves space for stringifying exceptions.") \
-    v(Unsigned, reservedZoneSize, 64 * KB, Normal, "The amount of stack space we guarantee to our clients (and to interal VM code that does not call out to clients).") \
+    v(Unsigned, maxPerThreadStackUsage, 80 * KB , Normal, "Max allowed stack usage by the VM") \
+    v(Unsigned, softReservedZoneSize, 32 * KB, Normal, "A buffer greater than reservedZoneSize that reserves space for stringifying exceptions.") \
+    v(Unsigned, reservedZoneSize, 16 * KB, Normal, "The amount of stack space we guarantee to our clients (and to interal VM code that does not call out to clients).") \
     \
     v(Bool, crashIfCantAllocateJITMemory, false, Normal, nullptr) \
     v(Unsigned, jitMemoryReservationSize, 0, Normal, "Set this number to change the executable allocation size in ExecutableAllocatorFixedVMPool. (In bytes.)") \