diff --git a/src/lib/netlist/devices/nld_2102A.cpp b/src/lib/netlist/devices/nld_2102A.cpp
index da8ffc3cc1d..8dbd5be8fec 100644
--- a/src/lib/netlist/devices/nld_2102A.cpp
+++ b/src/lib/netlist/devices/nld_2102A.cpp
@@ -38,7 +38,7 @@ namespace netlist
 
 		logic_output_t m_DO;
 
-		state_var<uint_fast8_t[128]> m_ram; // 1024x1 bits
+		state_var<uint8_t[128]> m_ram; // 1024x1 bits
 		param_ptr_t m_RAM;
 	};
 
@@ -81,8 +81,8 @@ namespace netlist
 
 			if (!m_RWQ())
 			{
-				m_ram[byte] &= ~(static_cast<uint_fast8_t>(1)      << bit);
-				m_ram[byte] |=  (static_cast<uint_fast8_t>(m_DI()) << bit);
+				m_ram[byte] &= ~(static_cast<uint8_t>(1)      << bit);
+				m_ram[byte] |=  (static_cast<uint8_t>(m_DI()) << bit);
 			}
 
 			m_DO.push((m_ram[byte] >> bit) & 1, max_delay);
diff --git a/src/lib/netlist/devices/nld_82S16.cpp b/src/lib/netlist/devices/nld_82S16.cpp
index 051fcd18ebe..fccdc8b1044 100644
--- a/src/lib/netlist/devices/nld_82S16.cpp
+++ b/src/lib/netlist/devices/nld_82S16.cpp
@@ -37,7 +37,7 @@ namespace netlist
 		logic_input_t m_DIN;
 		logic_output_t m_DOUTQ;
 
-		state_var<uint_fast64_t[4]> m_ram; // 256 bits
+		state_var<uint64_t[4]> m_ram; // 256 bits
 	};
 
 	NETLIB_OBJECT_DERIVED(82S16_dip, 82S16)
@@ -87,8 +87,8 @@ namespace netlist
 			if (!m_WEQ())
 			{
 				m_ram[adr >> 6] = (m_ram[adr >> 6]
-						& ~(static_cast<uint_fast64_t>(1) << (adr & 0x3f)))
-						| (static_cast<uint_fast64_t>(m_DIN()) << (adr & 0x3f));
+						& ~(static_cast<uint64_t>(1) << (adr & 0x3f)))
+						| (static_cast<uint64_t>(m_DIN()) << (adr & 0x3f));
 			}
 			m_DOUTQ.push(((m_ram[adr >> 6] >> (adr & 0x3f)) & 1) ^ 1, NLTIME_FROM_NS(20));
 		}
diff --git a/src/lib/netlist/devices/nld_am2847.cpp b/src/lib/netlist/devices/nld_am2847.cpp
index ec4eafc8dd6..f0517f20cf2 100644
--- a/src/lib/netlist/devices/nld_am2847.cpp
+++ b/src/lib/netlist/devices/nld_am2847.cpp
@@ -27,7 +27,7 @@ namespace netlist
 		logic_input_t m_RC;
 		logic_input_t m_IN;
 
-		state_var<uint_fast16_t[5]> m_buffer;
+		state_var<uint16_t[5]> m_buffer;
 
 		logic_output_t m_OUT;
 	};
@@ -66,7 +66,7 @@ namespace netlist
 		NETLIB_SUB(Am2847_shifter) m_D;
 		logic_input_t m_CP;
 
-		state_var<uint_fast32_t> m_last_CP;
+		state_var<uint32_t> m_last_CP;
 	};
 
 	NETLIB_OBJECT_DERIVED(AM2847_dip, AM2847)
@@ -111,10 +111,10 @@ namespace netlist
 	inline NETLIB_FUNC_VOID(Am2847_shifter, shift, (void))
 	{
 		unsigned out = m_buffer[0] & 1;
-		uint_fast32_t in = (m_RC() ? out : m_IN());
+		uint32_t in = (m_RC() ? out : m_IN());
 		for (std::size_t i=0; i < 5; i++)
 		{
-			uint_fast16_t shift_in = (i == 4) ? in : m_buffer[i + 1];
+			uint16_t shift_in = (i == 4) ? in : m_buffer[i + 1];
 			m_buffer[i] >>= 1;
 			m_buffer[i] |= shift_in << 15;
 		}
diff --git a/src/lib/netlist/nl_base.h b/src/lib/netlist/nl_base.h
index 7392d531877..ebfe65c14cc 100644
--- a/src/lib/netlist/nl_base.h
+++ b/src/lib/netlist/nl_base.h
@@ -355,15 +355,15 @@ namespace netlist
 	// State variables - predefined and c++11 non-optional
 	// -----------------------------------------------------------------------------
 
-	/*! predefined state variable type for uint_fast8_t */
-	using state_var_u8 = state_var<std::uint_fast8_t>;
-	/*! predefined state variable type for int_fast8_t */
-	using state_var_s8 = state_var<std::int_fast8_t>;
+	/*! predefined state variable type for uint8_t */
+	using state_var_u8 = state_var<std::uint8_t>;
+	/*! predefined state variable type for int8_t */
+	using state_var_s8 = state_var<std::int8_t>;
 
-	/*! predefined state variable type for uint_fast32_t */
-	using state_var_u32 = state_var<std::uint_fast32_t>;
-	/*! predefined state variable type for int_fast32_t */
-	using state_var_s32 = state_var<std::int_fast32_t>;
+	/*! predefined state variable type for uint32_t */
+	using state_var_u32 = state_var<std::uint32_t>;
+	/*! predefined state variable type for int32_t */
+	using state_var_s32 = state_var<std::int32_t>;
 
 	// -----------------------------------------------------------------------------
 	// object_t
diff --git a/src/lib/netlist/nl_time.h b/src/lib/netlist/nl_time.h
index 9eb1dae0ad8..4edc9524a43 100644
--- a/src/lib/netlist/nl_time.h
+++ b/src/lib/netlist/nl_time.h
@@ -33,7 +33,7 @@ namespace netlist
 	public:
 
 		using internal_type = TYPE;
-		using mult_type = std::uint_fast64_t;
+		using mult_type = std::uint64_t;
 		static constexpr internal_type resolution = RES;
 
 		constexpr ptime() noexcept : m_time(0) {}
@@ -127,7 +127,7 @@ namespace netlist
 #if (PHAS_INT128)
 	using netlist_time = ptime<UINT128, NETLIST_INTERNAL_RES>;
 #else
-	using netlist_time = ptime<std::uint_fast64_t, NETLIST_INTERNAL_RES>;
+	using netlist_time = ptime<std::uint64_t, NETLIST_INTERNAL_RES>;
 #endif
 }