diff --git a/sdc-plugin/tests/Makefile b/sdc-plugin/tests/Makefile
index ea5e5a1..d19f19d 100644
--- a/sdc-plugin/tests/Makefile
+++ b/sdc-plugin/tests/Makefile
@@ -1,4 +1,4 @@
-TESTS = counter counter2 pll pll_div pll_fbout_phase
+TESTS = counter counter2 pll pll_div pll_fbout_phase pll_approx_equal
 .PHONY: $(TESTS)
 
 counter_verify = $(call compare,counter,sdc) && $(call compare,counter,txt)
@@ -6,6 +6,7 @@
 pll_verify = $(call compare,pll,sdc)
 pll_div_verify = $(call compare,pll_div,sdc)
 pll_fbout_phase_verify = $(call compare,pll_fbout_phase,sdc)
+pll_approx_equal_verify = $(call compare,pll_approx_equal,sdc)
 
 all: $(TESTS)
 compare = diff $(1)/$(1).golden.$(2) $(1)/$(1).$(2)
diff --git a/sdc-plugin/tests/pll_approx_equal/pll_approx_equal.golden.sdc b/sdc-plugin/tests/pll_approx_equal/pll_approx_equal.golden.sdc
new file mode 100644
index 0000000..c27b90a
--- /dev/null
+++ b/sdc-plugin/tests/pll_approx_equal/pll_approx_equal.golden.sdc
@@ -0,0 +1,8 @@
+create_clock -period 10 -waveform {0 5} \$auto\$clkbufmap.cc:247:execute\$1829
+create_clock -period 10 -waveform {0 5} \$techmap1716\FDCE_0.C
+create_clock -period 9.91 -waveform {0 4.955} \$auto\$clkbufmap.cc:247:execute\$1831
+create_clock -period 9.91 -waveform {0 4.955} main_clkout_x1
+create_clock -period 4.955 -waveform {-2.4775 0} \$auto\$clkbufmap.cc:247:execute\$1833
+create_clock -period 4.955 -waveform {-2.4775 0} main_clkout_x2
+create_clock -period 2.4775 -waveform {-1.85812 -0.619375} \$auto\$clkbufmap.cc:247:execute\$1835
+create_clock -period 2.4775 -waveform {-1.85812 -0.619375} main_clkout_x4
diff --git a/sdc-plugin/tests/pll_approx_equal/pll_approx_equal.input.sdc b/sdc-plugin/tests/pll_approx_equal/pll_approx_equal.input.sdc
new file mode 100644
index 0000000..00354d7
--- /dev/null
+++ b/sdc-plugin/tests/pll_approx_equal/pll_approx_equal.input.sdc
@@ -0,0 +1 @@
+create_clock -period 10 -waveform {0 5} clk
diff --git a/sdc-plugin/tests/pll_approx_equal/pll_approx_equal.tcl b/sdc-plugin/tests/pll_approx_equal/pll_approx_equal.tcl
new file mode 100644
index 0000000..13c8890
--- /dev/null
+++ b/sdc-plugin/tests/pll_approx_equal/pll_approx_equal.tcl
@@ -0,0 +1,21 @@
+yosys -import
+plugin -i sdc
+# Import the commands from the plugins to the tcl interpreter
+yosys -import
+
+read_verilog pll_approx_equal.v
+read_verilog -specify -lib -D_EXPLICIT_CARRY +/xilinx/cells_sim.v
+read_verilog -lib +/xilinx/cells_xtra.v
+hierarchy -check -auto-top
+
+# Start flow after library reading
+synth_xilinx -vpr -flatten -abc9 -nosrl -nodsp -iopad -run prepare:check
+
+# Read the design timing constraints
+read_sdc $::env(INPUT_SDC_FILE)
+
+# Propagate the clocks
+propagate_clocks
+
+# Write out the SDC file after the clock propagation step
+write_sdc $::env(OUTPUT_SDC_FILE)
diff --git a/sdc-plugin/tests/pll_approx_equal/pll_approx_equal.v b/sdc-plugin/tests/pll_approx_equal/pll_approx_equal.v
new file mode 100644
index 0000000..9b2e13a
--- /dev/null
+++ b/sdc-plugin/tests/pll_approx_equal/pll_approx_equal.v
@@ -0,0 +1,91 @@
+module top(
+	input clk,
+	input cpu_reset,
+	input data_in,
+	output[5:0] data_out
+);
+
+wire [5:0] data_out;
+wire builder_pll_fb;
+wire fdce_0_out, fdce_1_out;
+wire main_locked;
+
+FDCE FDCE_0 (
+	.D(data_in),
+	.C(clk),
+	.CE(1'b1),
+	.CLR(1'b0),
+	.Q(fdce_0_out)
+);
+
+FDCE FDCE_1 (
+	.D(fdce_0_out),
+	.C(clk),
+	.CE(1'b1),
+	.CLR(1'b0),
+	.Q(data_out[0])
+);
+
+PLLE2_ADV #(
+	.CLKFBOUT_MULT(4'd12),
+	.CLKFBOUT_PHASE(90.0),
+	.CLKIN1_PERIOD(9.91),
+	.CLKOUT0_DIVIDE(4'd12),
+	.CLKOUT0_PHASE(90.0),
+	.CLKOUT1_DIVIDE(3'd6),
+	.CLKOUT1_PHASE(0.0),
+	.CLKOUT2_DIVIDE(2'd3),
+	.CLKOUT2_PHASE(90.0),
+	.REF_JITTER1(0.01),
+	.STARTUP_WAIT("FALSE")
+) PLLE2_ADV (
+	.CLKFBIN(builder_pll_fb),
+	.CLKIN1(clk),
+	.RST(cpu_reset),
+	.CLKFBOUT(builder_pll_fb),
+	.CLKOUT0(main_clkout_x1),
+	.CLKOUT1(main_clkout_x2),
+	.CLKOUT2(main_clkout_x4),
+	.LOCKED(main_locked)
+);
+
+FDCE FDCE_PLLx1_PH90 (
+	.D(data_in),
+	.C(main_clkout_x1),
+	.CE(1'b1),
+	.CLR(1'b0),
+	.Q(data_out[1])
+);
+
+FDCE FDCE_PLLx4_PH0_0 (
+	.D(data_in),
+	.C(main_clkout_x2),
+	.CE(1'b1),
+	.CLR(1'b0),
+	.Q(data_out[2])
+);
+
+FDCE FDCE_PLLx4_PH0_1 (
+	.D(data_in),
+	.C(main_clkout_x2),
+	.CE(1'b1),
+	.CLR(1'b0),
+	.Q(data_out[3])
+);
+
+FDCE FDCE_PLLx4_PH0_2 (
+	.D(data_in),
+	.C(main_clkout_x2),
+	.CE(1'b1),
+	.CLR(1'b0),
+	.Q(data_out[4])
+);
+
+FDCE FDCE_PLLx2_PH90_0 (
+	.D(data_in),
+	.C(main_clkout_x4),
+	.CE(1'b1),
+	.CLR(1'b0),
+	.Q(data_out[5])
+);
+endmodule